src/HOL/Library/Multiset.thy
author blanchet
Fri, 24 Jan 2014 11:51:45 +0100
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(*  Title:      HOL/Library/Multiset.thy
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    Author:     Tobias Nipkow, Markus Wenzel, Lawrence C Paulson, Norbert Voelker
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    Author:     Andrei Popescu, TU Muenchen
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*)
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header {* (Finite) multisets *}
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theory Multiset
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imports Main
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begin
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subsection {* The type of multisets *}
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definition "multiset = {f :: 'a => nat. finite {x. f x > 0}}"
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typedef 'a multiset = "multiset :: ('a => nat) set"
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  morphisms count Abs_multiset
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  unfolding multiset_def
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proof
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  show "(\<lambda>x. 0::nat) \<in> {f. finite {x. f x > 0}}" by simp
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qed
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setup_lifting type_definition_multiset
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abbreviation Melem :: "'a => 'a multiset => bool"  ("(_/ :# _)" [50, 51] 50) where
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  "a :# M == 0 < count M a"
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notation (xsymbols)
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  Melem (infix "\<in>#" 50)
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lemma multiset_eq_iff:
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  "M = N \<longleftrightarrow> (\<forall>a. count M a = count N a)"
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  by (simp only: count_inject [symmetric] fun_eq_iff)
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lemma multiset_eqI:
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  "(\<And>x. count A x = count B x) \<Longrightarrow> A = B"
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  using multiset_eq_iff by auto
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text {*
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 \medskip Preservation of the representing set @{term multiset}.
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*}
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lemma const0_in_multiset:
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  "(\<lambda>a. 0) \<in> multiset"
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  by (simp add: multiset_def)
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lemma only1_in_multiset:
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  "(\<lambda>b. if b = a then n else 0) \<in> multiset"
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  by (simp add: multiset_def)
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lemma union_preserves_multiset:
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  "M \<in> multiset \<Longrightarrow> N \<in> multiset \<Longrightarrow> (\<lambda>a. M a + N a) \<in> multiset"
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  by (simp add: multiset_def)
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lemma diff_preserves_multiset:
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  assumes "M \<in> multiset"
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  shows "(\<lambda>a. M a - N a) \<in> multiset"
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proof -
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  have "{x. N x < M x} \<subseteq> {x. 0 < M x}"
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    by auto
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  with assms show ?thesis
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    by (auto simp add: multiset_def intro: finite_subset)
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qed
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lemma filter_preserves_multiset:
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  assumes "M \<in> multiset"
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  shows "(\<lambda>x. if P x then M x else 0) \<in> multiset"
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proof -
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  have "{x. (P x \<longrightarrow> 0 < M x) \<and> P x} \<subseteq> {x. 0 < M x}"
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    by auto
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  with assms show ?thesis
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    by (auto simp add: multiset_def intro: finite_subset)
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qed
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lemmas in_multiset = const0_in_multiset only1_in_multiset
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  union_preserves_multiset diff_preserves_multiset filter_preserves_multiset
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subsection {* Representing multisets *}
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text {* Multiset enumeration *}
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instantiation multiset :: (type) cancel_comm_monoid_add
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begin
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lift_definition zero_multiset :: "'a multiset" is "\<lambda>a. 0"
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by (rule const0_in_multiset)
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abbreviation Mempty :: "'a multiset" ("{#}") where
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  "Mempty \<equiv> 0"
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lift_definition plus_multiset :: "'a multiset => 'a multiset => 'a multiset" is "\<lambda>M N. (\<lambda>a. M a + N a)"
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by (rule union_preserves_multiset)
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instance
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by default (transfer, simp add: fun_eq_iff)+
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end
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lift_definition single :: "'a => 'a multiset" is "\<lambda>a b. if b = a then 1 else 0"
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by (rule only1_in_multiset)
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syntax
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  "_multiset" :: "args => 'a multiset"    ("{#(_)#}")
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translations
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  "{#x, xs#}" == "{#x#} + {#xs#}"
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  "{#x#}" == "CONST single x"
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lemma count_empty [simp]: "count {#} a = 0"
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  by (simp add: zero_multiset.rep_eq)
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lemma count_single [simp]: "count {#b#} a = (if b = a then 1 else 0)"
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  by (simp add: single.rep_eq)
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subsection {* Basic operations *}
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subsubsection {* Union *}
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lemma count_union [simp]: "count (M + N) a = count M a + count N a"
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  by (simp add: plus_multiset.rep_eq)
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e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
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e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
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subsubsection {* Difference *}
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instantiation multiset :: (type) comm_monoid_diff
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begin
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lift_definition minus_multiset :: "'a multiset => 'a multiset => 'a multiset" is "\<lambda> M N. \<lambda>a. M a - N a"
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by (rule diff_preserves_multiset)
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instance
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by default (transfer, simp add: fun_eq_iff)+
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end
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lemma count_diff [simp]: "count (M - N) a = count M a - count N a"
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  by (simp add: minus_multiset.rep_eq)
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lemma diff_empty [simp]: "M - {#} = M \<and> {#} - M = {#}"
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  by rule (fact Groups.diff_zero, fact Groups.zero_diff)
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lemma diff_cancel[simp]: "A - A = {#}"
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  by (fact Groups.diff_cancel)
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lemma diff_union_cancelR [simp]: "M + N - N = (M::'a multiset)"
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  by (fact add_diff_cancel_right')
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lemma diff_union_cancelL [simp]: "N + M - N = (M::'a multiset)"
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  by (fact add_diff_cancel_left')
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lemma diff_right_commute:
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  "(M::'a multiset) - N - Q = M - Q - N"
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  by (fact diff_right_commute)
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lemma diff_add:
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  "(M::'a multiset) - (N + Q) = M - N - Q"
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  by (rule sym) (fact diff_diff_add)
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   160
lemma insert_DiffM:
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  "x \<in># M \<Longrightarrow> {#x#} + (M - {#x#}) = M"
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  by (clarsimp simp: multiset_eq_iff)
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lemma insert_DiffM2 [simp]:
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  "x \<in># M \<Longrightarrow> M - {#x#} + {#x#} = M"
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   166
  by (clarsimp simp: multiset_eq_iff)
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lemma diff_union_swap:
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  "a \<noteq> b \<Longrightarrow> M - {#a#} + {#b#} = M + {#b#} - {#a#}"
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  by (auto simp add: multiset_eq_iff)
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lemma diff_union_single_conv:
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  "a \<in># J \<Longrightarrow> I + J - {#a#} = I + (J - {#a#})"
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   174
  by (simp add: multiset_eq_iff)
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subsubsection {* Equality of multisets *}
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lemma single_not_empty [simp]: "{#a#} \<noteq> {#} \<and> {#} \<noteq> {#a#}"
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  by (simp add: multiset_eq_iff)
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lemma single_eq_single [simp]: "{#a#} = {#b#} \<longleftrightarrow> a = b"
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   183
  by (auto simp add: multiset_eq_iff)
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lemma union_eq_empty [iff]: "M + N = {#} \<longleftrightarrow> M = {#} \<and> N = {#}"
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   186
  by (auto simp add: multiset_eq_iff)
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   188
lemma empty_eq_union [iff]: "{#} = M + N \<longleftrightarrow> M = {#} \<and> N = {#}"
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   189
  by (auto simp add: multiset_eq_iff)
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   191
lemma multi_self_add_other_not_self [simp]: "M = M + {#x#} \<longleftrightarrow> False"
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   192
  by (auto simp add: multiset_eq_iff)
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   193
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   194
lemma diff_single_trivial:
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   195
  "\<not> x \<in># M \<Longrightarrow> M - {#x#} = M"
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   196
  by (auto simp add: multiset_eq_iff)
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   197
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lemma diff_single_eq_union:
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   199
  "x \<in># M \<Longrightarrow> M - {#x#} = N \<longleftrightarrow> M = N + {#x#}"
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   200
  by auto
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   201
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   202
lemma union_single_eq_diff:
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   203
  "M + {#x#} = N \<Longrightarrow> M = N - {#x#}"
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   204
  by (auto dest: sym)
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   205
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   206
lemma union_single_eq_member:
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   207
  "M + {#x#} = N \<Longrightarrow> x \<in># N"
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   208
  by auto
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   209
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   210
lemma union_is_single:
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   211
  "M + N = {#a#} \<longleftrightarrow> M = {#a#} \<and> N={#} \<or> M = {#} \<and> N = {#a#}" (is "?lhs = ?rhs")
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   212
proof
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  assume ?rhs then show ?lhs by auto
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   214
next
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   215
  assume ?lhs then show ?rhs
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   216
    by (simp add: multiset_eq_iff split:if_splits) (metis add_is_1)
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   217
qed
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   218
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   219
lemma single_is_union:
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  "{#a#} = M + N \<longleftrightarrow> {#a#} = M \<and> N = {#} \<or> M = {#} \<and> {#a#} = N"
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   221
  by (auto simp add: eq_commute [of "{#a#}" "M + N"] union_is_single)
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   222
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   223
lemma add_eq_conv_diff:
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   224
  "M + {#a#} = N + {#b#} \<longleftrightarrow> M = N \<and> a = b \<or> M = N - {#a#} + {#b#} \<and> N = M - {#b#} + {#a#}"  (is "?lhs = ?rhs")
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   225
(* shorter: by (simp add: multiset_eq_iff) fastforce *)
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   226
proof
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   227
  assume ?rhs then show ?lhs
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   228
  by (auto simp add: add_assoc add_commute [of "{#b#}"])
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   229
    (drule sym, simp add: add_assoc [symmetric])
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   230
next
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   231
  assume ?lhs
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   232
  show ?rhs
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   233
  proof (cases "a = b")
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diff changeset
   234
    case True with `?lhs` show ?thesis by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   235
  next
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   236
    case False
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   237
    from `?lhs` have "a \<in># N + {#b#}" by (rule union_single_eq_member)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   238
    with False have "a \<in># N" by auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   239
    moreover from `?lhs` have "M = N + {#b#} - {#a#}" by (rule union_single_eq_diff)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   240
    moreover note False
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   241
    ultimately show ?thesis by (auto simp add: diff_right_commute [of _ "{#a#}"] diff_union_swap)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   242
  qed
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   243
qed
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   244
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   245
lemma insert_noteq_member: 
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   246
  assumes BC: "B + {#b#} = C + {#c#}"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   247
   and bnotc: "b \<noteq> c"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   248
  shows "c \<in># B"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   249
proof -
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   250
  have "c \<in># C + {#c#}" by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   251
  have nc: "\<not> c \<in># {#b#}" using bnotc by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   252
  then have "c \<in># B + {#b#}" using BC by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   253
  then show "c \<in># B" using nc by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   254
qed
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   255
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   256
lemma add_eq_conv_ex:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   257
  "(M + {#a#} = N + {#b#}) =
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   258
    (M = N \<and> a = b \<or> (\<exists>K. M = K + {#b#} \<and> N = K + {#a#}))"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   259
  by (auto simp add: add_eq_conv_diff)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   260
51600
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   261
lemma multi_member_split:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   262
  "x \<in># M \<Longrightarrow> \<exists>A. M = A + {#x#}"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   263
  by (rule_tac x = "M - {#x#}" in exI, simp)
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   264
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   265
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   266
subsubsection {* Pointwise ordering induced by count *}
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   267
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   268
instantiation multiset :: (type) ordered_ab_semigroup_add_imp_le
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   269
begin
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   270
47429
ec64d94cbf9c multiset operations are defined with lift_definitions;
bulwahn
parents: 47308
diff changeset
   271
lift_definition less_eq_multiset :: "'a multiset \<Rightarrow> 'a multiset \<Rightarrow> bool" is "\<lambda> A B. (\<forall>a. A a \<le> B a)"
ec64d94cbf9c multiset operations are defined with lift_definitions;
bulwahn
parents: 47308
diff changeset
   272
by simp
ec64d94cbf9c multiset operations are defined with lift_definitions;
bulwahn
parents: 47308
diff changeset
   273
lemmas mset_le_def = less_eq_multiset_def
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   274
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   275
definition less_multiset :: "'a multiset \<Rightarrow> 'a multiset \<Rightarrow> bool" where
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   276
  mset_less_def: "(A::'a multiset) < B \<longleftrightarrow> A \<le> B \<and> A \<noteq> B"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   277
46921
aa862ff8a8a9 some proof indentation;
wenzelm
parents: 46756
diff changeset
   278
instance
aa862ff8a8a9 some proof indentation;
wenzelm
parents: 46756
diff changeset
   279
  by default (auto simp add: mset_le_def mset_less_def multiset_eq_iff intro: order_trans antisym)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   280
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   281
end
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   282
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   283
lemma mset_less_eqI:
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   284
  "(\<And>x. count A x \<le> count B x) \<Longrightarrow> A \<le> B"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   285
  by (simp add: mset_le_def)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   286
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   287
lemma mset_le_exists_conv:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   288
  "(A::'a multiset) \<le> B \<longleftrightarrow> (\<exists>C. B = A + C)"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   289
apply (unfold mset_le_def, rule iffI, rule_tac x = "B - A" in exI)
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   290
apply (auto intro: multiset_eq_iff [THEN iffD2])
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   291
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   292
52289
83ce5d2841e7 type class for confined subtraction
haftmann
parents: 51623
diff changeset
   293
instance multiset :: (type) ordered_cancel_comm_monoid_diff
83ce5d2841e7 type class for confined subtraction
haftmann
parents: 51623
diff changeset
   294
  by default (simp, fact mset_le_exists_conv)
83ce5d2841e7 type class for confined subtraction
haftmann
parents: 51623
diff changeset
   295
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   296
lemma mset_le_mono_add_right_cancel [simp]:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   297
  "(A::'a multiset) + C \<le> B + C \<longleftrightarrow> A \<le> B"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   298
  by (fact add_le_cancel_right)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   299
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   300
lemma mset_le_mono_add_left_cancel [simp]:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   301
  "C + (A::'a multiset) \<le> C + B \<longleftrightarrow> A \<le> B"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   302
  by (fact add_le_cancel_left)
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   303
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   304
lemma mset_le_mono_add:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   305
  "(A::'a multiset) \<le> B \<Longrightarrow> C \<le> D \<Longrightarrow> A + C \<le> B + D"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   306
  by (fact add_mono)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   307
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   308
lemma mset_le_add_left [simp]:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   309
  "(A::'a multiset) \<le> A + B"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   310
  unfolding mset_le_def by auto
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   311
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   312
lemma mset_le_add_right [simp]:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   313
  "B \<le> (A::'a multiset) + B"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   314
  unfolding mset_le_def by auto
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   315
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   316
lemma mset_le_single:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   317
  "a :# B \<Longrightarrow> {#a#} \<le> B"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   318
  by (simp add: mset_le_def)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   319
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   320
lemma multiset_diff_union_assoc:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   321
  "C \<le> B \<Longrightarrow> (A::'a multiset) + B - C = A + (B - C)"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   322
  by (simp add: multiset_eq_iff mset_le_def)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   323
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   324
lemma mset_le_multiset_union_diff_commute:
36867
6c28c702ed22 simplified proof
nipkow
parents: 36635
diff changeset
   325
  "B \<le> A \<Longrightarrow> (A::'a multiset) - B + C = A + C - B"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   326
by (simp add: multiset_eq_iff mset_le_def)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   327
39301
e1bd8a54c40f added and renamed lemmas
nipkow
parents: 39198
diff changeset
   328
lemma diff_le_self[simp]: "(M::'a multiset) - N \<le> M"
e1bd8a54c40f added and renamed lemmas
nipkow
parents: 39198
diff changeset
   329
by(simp add: mset_le_def)
e1bd8a54c40f added and renamed lemmas
nipkow
parents: 39198
diff changeset
   330
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   331
lemma mset_lessD: "A < B \<Longrightarrow> x \<in># A \<Longrightarrow> x \<in># B"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   332
apply (clarsimp simp: mset_le_def mset_less_def)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   333
apply (erule_tac x=x in allE)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   334
apply auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   335
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   336
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   337
lemma mset_leD: "A \<le> B \<Longrightarrow> x \<in># A \<Longrightarrow> x \<in># B"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   338
apply (clarsimp simp: mset_le_def mset_less_def)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   339
apply (erule_tac x = x in allE)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   340
apply auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   341
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   342
  
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   343
lemma mset_less_insertD: "(A + {#x#} < B) \<Longrightarrow> (x \<in># B \<and> A < B)"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   344
apply (rule conjI)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   345
 apply (simp add: mset_lessD)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   346
apply (clarsimp simp: mset_le_def mset_less_def)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   347
apply safe
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   348
 apply (erule_tac x = a in allE)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   349
 apply (auto split: split_if_asm)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   350
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   351
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   352
lemma mset_le_insertD: "(A + {#x#} \<le> B) \<Longrightarrow> (x \<in># B \<and> A \<le> B)"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   353
apply (rule conjI)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   354
 apply (simp add: mset_leD)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   355
apply (force simp: mset_le_def mset_less_def split: split_if_asm)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   356
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   357
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   358
lemma mset_less_of_empty[simp]: "A < {#} \<longleftrightarrow> False"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   359
  by (auto simp add: mset_less_def mset_le_def multiset_eq_iff)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   360
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   361
lemma multi_psub_of_add_self[simp]: "A < A + {#x#}"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   362
  by (auto simp: mset_le_def mset_less_def)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   363
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   364
lemma multi_psub_self[simp]: "(A::'a multiset) < A = False"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   365
  by simp
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   366
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   367
lemma mset_less_add_bothsides:
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   368
  "T + {#x#} < S + {#x#} \<Longrightarrow> T < S"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   369
  by (fact add_less_imp_less_right)
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   370
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   371
lemma mset_less_empty_nonempty:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   372
  "{#} < S \<longleftrightarrow> S \<noteq> {#}"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   373
  by (auto simp: mset_le_def mset_less_def)
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   374
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   375
lemma mset_less_diff_self:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   376
  "c \<in># B \<Longrightarrow> B - {#c#} < B"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   377
  by (auto simp: mset_le_def mset_less_def multiset_eq_iff)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   378
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   379
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   380
subsubsection {* Intersection *}
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   381
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   382
instantiation multiset :: (type) semilattice_inf
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   383
begin
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   384
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   385
definition inf_multiset :: "'a multiset \<Rightarrow> 'a multiset \<Rightarrow> 'a multiset" where
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   386
  multiset_inter_def: "inf_multiset A B = A - (A - B)"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   387
46921
aa862ff8a8a9 some proof indentation;
wenzelm
parents: 46756
diff changeset
   388
instance
aa862ff8a8a9 some proof indentation;
wenzelm
parents: 46756
diff changeset
   389
proof -
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   390
  have aux: "\<And>m n q :: nat. m \<le> n \<Longrightarrow> m \<le> q \<Longrightarrow> m \<le> n - (n - q)" by arith
46921
aa862ff8a8a9 some proof indentation;
wenzelm
parents: 46756
diff changeset
   391
  show "OFCLASS('a multiset, semilattice_inf_class)"
aa862ff8a8a9 some proof indentation;
wenzelm
parents: 46756
diff changeset
   392
    by default (auto simp add: multiset_inter_def mset_le_def aux)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   393
qed
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   394
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   395
end
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   396
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   397
abbreviation multiset_inter :: "'a multiset \<Rightarrow> 'a multiset \<Rightarrow> 'a multiset" (infixl "#\<inter>" 70) where
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   398
  "multiset_inter \<equiv> inf"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   399
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   400
lemma multiset_inter_count [simp]:
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   401
  "count (A #\<inter> B) x = min (count A x) (count B x)"
47429
ec64d94cbf9c multiset operations are defined with lift_definitions;
bulwahn
parents: 47308
diff changeset
   402
  by (simp add: multiset_inter_def)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   403
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   404
lemma multiset_inter_single: "a \<noteq> b \<Longrightarrow> {#a#} #\<inter> {#b#} = {#}"
46730
e3b99d0231bc tuned proofs;
wenzelm
parents: 46394
diff changeset
   405
  by (rule multiset_eqI) auto
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   406
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   407
lemma multiset_union_diff_commute:
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   408
  assumes "B #\<inter> C = {#}"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   409
  shows "A + B - C = A - C + B"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   410
proof (rule multiset_eqI)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   411
  fix x
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   412
  from assms have "min (count B x) (count C x) = 0"
46730
e3b99d0231bc tuned proofs;
wenzelm
parents: 46394
diff changeset
   413
    by (auto simp add: multiset_eq_iff)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   414
  then have "count B x = 0 \<or> count C x = 0"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   415
    by auto
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   416
  then show "count (A + B - C) x = count (A - C + B) x"
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   417
    by auto
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   418
qed
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   419
51600
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   420
lemma empty_inter [simp]:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   421
  "{#} #\<inter> M = {#}"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   422
  by (simp add: multiset_eq_iff)
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   423
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   424
lemma inter_empty [simp]:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   425
  "M #\<inter> {#} = {#}"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   426
  by (simp add: multiset_eq_iff)
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   427
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   428
lemma inter_add_left1:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   429
  "\<not> x \<in># N \<Longrightarrow> (M + {#x#}) #\<inter> N = M #\<inter> N"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   430
  by (simp add: multiset_eq_iff)
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   431
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   432
lemma inter_add_left2:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   433
  "x \<in># N \<Longrightarrow> (M + {#x#}) #\<inter> N = (M #\<inter> (N - {#x#})) + {#x#}"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   434
  by (simp add: multiset_eq_iff)
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   435
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   436
lemma inter_add_right1:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   437
  "\<not> x \<in># N \<Longrightarrow> N #\<inter> (M + {#x#}) = N #\<inter> M"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   438
  by (simp add: multiset_eq_iff)
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   439
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   440
lemma inter_add_right2:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   441
  "x \<in># N \<Longrightarrow> N #\<inter> (M + {#x#}) = ((N - {#x#}) #\<inter> M) + {#x#}"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   442
  by (simp add: multiset_eq_iff)
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
   443
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   444
51623
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   445
subsubsection {* Bounded union *}
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   446
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   447
instantiation multiset :: (type) semilattice_sup
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   448
begin
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   449
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   450
definition sup_multiset :: "'a multiset \<Rightarrow> 'a multiset \<Rightarrow> 'a multiset" where
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   451
  "sup_multiset A B = A + (B - A)"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   452
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   453
instance
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   454
proof -
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   455
  have aux: "\<And>m n q :: nat. m \<le> n \<Longrightarrow> q \<le> n \<Longrightarrow> m + (q - m) \<le> n" by arith
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   456
  show "OFCLASS('a multiset, semilattice_sup_class)"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   457
    by default (auto simp add: sup_multiset_def mset_le_def aux)
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   458
qed
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   459
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   460
end
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   461
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   462
abbreviation sup_multiset :: "'a multiset \<Rightarrow> 'a multiset \<Rightarrow> 'a multiset" (infixl "#\<union>" 70) where
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   463
  "sup_multiset \<equiv> sup"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   464
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   465
lemma sup_multiset_count [simp]:
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   466
  "count (A #\<union> B) x = max (count A x) (count B x)"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   467
  by (simp add: sup_multiset_def)
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   468
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   469
lemma empty_sup [simp]:
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   470
  "{#} #\<union> M = M"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   471
  by (simp add: multiset_eq_iff)
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   472
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   473
lemma sup_empty [simp]:
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   474
  "M #\<union> {#} = M"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   475
  by (simp add: multiset_eq_iff)
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   476
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   477
lemma sup_add_left1:
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   478
  "\<not> x \<in># N \<Longrightarrow> (M + {#x#}) #\<union> N = (M #\<union> N) + {#x#}"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   479
  by (simp add: multiset_eq_iff)
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   480
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   481
lemma sup_add_left2:
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   482
  "x \<in># N \<Longrightarrow> (M + {#x#}) #\<union> N = (M #\<union> (N - {#x#})) + {#x#}"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   483
  by (simp add: multiset_eq_iff)
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   484
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   485
lemma sup_add_right1:
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   486
  "\<not> x \<in># N \<Longrightarrow> N #\<union> (M + {#x#}) = (N #\<union> M) + {#x#}"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   487
  by (simp add: multiset_eq_iff)
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   488
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   489
lemma sup_add_right2:
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   490
  "x \<in># N \<Longrightarrow> N #\<union> (M + {#x#}) = ((N - {#x#}) #\<union> M) + {#x#}"
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   491
  by (simp add: multiset_eq_iff)
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   492
1194b438426a sup on multisets
haftmann
parents: 51600
diff changeset
   493
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   494
subsubsection {* Filter (with comprehension syntax) *}
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   495
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   496
text {* Multiset comprehension *}
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   497
47429
ec64d94cbf9c multiset operations are defined with lift_definitions;
bulwahn
parents: 47308
diff changeset
   498
lift_definition filter :: "('a \<Rightarrow> bool) \<Rightarrow> 'a multiset \<Rightarrow> 'a multiset" is "\<lambda>P M. \<lambda>x. if P x then M x else 0"
ec64d94cbf9c multiset operations are defined with lift_definitions;
bulwahn
parents: 47308
diff changeset
   499
by (rule filter_preserves_multiset)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   500
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   501
hide_const (open) filter
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   502
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   503
lemma count_filter [simp]:
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   504
  "count (Multiset.filter P M) a = (if P a then count M a else 0)"
47429
ec64d94cbf9c multiset operations are defined with lift_definitions;
bulwahn
parents: 47308
diff changeset
   505
  by (simp add: filter.rep_eq)
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   506
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   507
lemma filter_empty [simp]:
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   508
  "Multiset.filter P {#} = {#}"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   509
  by (rule multiset_eqI) simp
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   510
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   511
lemma filter_single [simp]:
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   512
  "Multiset.filter P {#x#} = (if P x then {#x#} else {#})"
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   513
  by (rule multiset_eqI) simp
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   514
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   515
lemma filter_union [simp]:
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   516
  "Multiset.filter P (M + N) = Multiset.filter P M + Multiset.filter P N"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   517
  by (rule multiset_eqI) simp
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   518
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   519
lemma filter_diff [simp]:
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   520
  "Multiset.filter P (M - N) = Multiset.filter P M - Multiset.filter P N"
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   521
  by (rule multiset_eqI) simp
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   522
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   523
lemma filter_inter [simp]:
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   524
  "Multiset.filter P (M #\<inter> N) = Multiset.filter P M #\<inter> Multiset.filter P N"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   525
  by (rule multiset_eqI) simp
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   526
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   527
syntax
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   528
  "_MCollect" :: "pttrn \<Rightarrow> 'a multiset \<Rightarrow> bool \<Rightarrow> 'a multiset"    ("(1{# _ :# _./ _#})")
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   529
syntax (xsymbol)
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   530
  "_MCollect" :: "pttrn \<Rightarrow> 'a multiset \<Rightarrow> bool \<Rightarrow> 'a multiset"    ("(1{# _ \<in># _./ _#})")
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   531
translations
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   532
  "{#x \<in># M. P#}" == "CONST Multiset.filter (\<lambda>x. P) M"
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   533
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   534
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   535
subsubsection {* Set of elements *}
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   536
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   537
definition set_of :: "'a multiset => 'a set" where
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   538
  "set_of M = {x. x :# M}"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   539
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   540
lemma set_of_empty [simp]: "set_of {#} = {}"
26178
nipkow
parents: 26176
diff changeset
   541
by (simp add: set_of_def)
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   542
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   543
lemma set_of_single [simp]: "set_of {#b#} = {b}"
26178
nipkow
parents: 26176
diff changeset
   544
by (simp add: set_of_def)
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   545
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   546
lemma set_of_union [simp]: "set_of (M + N) = set_of M \<union> set_of N"
26178
nipkow
parents: 26176
diff changeset
   547
by (auto simp add: set_of_def)
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   548
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   549
lemma set_of_eq_empty_iff [simp]: "(set_of M = {}) = (M = {#})"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   550
by (auto simp add: set_of_def multiset_eq_iff)
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   551
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   552
lemma mem_set_of_iff [simp]: "(x \<in> set_of M) = (x :# M)"
26178
nipkow
parents: 26176
diff changeset
   553
by (auto simp add: set_of_def)
26016
f9d1bf2fc59c added multiset comprehension
nipkow
parents: 25759
diff changeset
   554
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   555
lemma set_of_filter [simp]: "set_of {# x:#M. P x #} = set_of M \<inter> {x. P x}"
26178
nipkow
parents: 26176
diff changeset
   556
by (auto simp add: set_of_def)
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   557
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   558
lemma finite_set_of [iff]: "finite (set_of M)"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   559
  using count [of M] by (simp add: multiset_def set_of_def)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   560
46756
faf62905cd53 adding finiteness of intervals on integer sets; adding another finiteness theorem for multisets
bulwahn
parents: 46730
diff changeset
   561
lemma finite_Collect_mem [iff]: "finite {x. x :# M}"
faf62905cd53 adding finiteness of intervals on integer sets; adding another finiteness theorem for multisets
bulwahn
parents: 46730
diff changeset
   562
  unfolding set_of_def[symmetric] by simp
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   563
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   564
subsubsection {* Size *}
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   565
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   566
instantiation multiset :: (type) size
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   567
begin
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   568
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   569
definition size_def:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   570
  "size M = setsum (count M) (set_of M)"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   571
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   572
instance ..
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   573
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   574
end
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   575
28708
a1a436f09ec6 explicit check for pattern discipline before code translation
haftmann
parents: 28562
diff changeset
   576
lemma size_empty [simp]: "size {#} = 0"
26178
nipkow
parents: 26176
diff changeset
   577
by (simp add: size_def)
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   578
28708
a1a436f09ec6 explicit check for pattern discipline before code translation
haftmann
parents: 28562
diff changeset
   579
lemma size_single [simp]: "size {#b#} = 1"
26178
nipkow
parents: 26176
diff changeset
   580
by (simp add: size_def)
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   581
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   582
lemma setsum_count_Int:
26178
nipkow
parents: 26176
diff changeset
   583
  "finite A ==> setsum (count N) (A \<inter> set_of N) = setsum (count N) A"
nipkow
parents: 26176
diff changeset
   584
apply (induct rule: finite_induct)
nipkow
parents: 26176
diff changeset
   585
 apply simp
nipkow
parents: 26176
diff changeset
   586
apply (simp add: Int_insert_left set_of_def)
nipkow
parents: 26176
diff changeset
   587
done
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   588
28708
a1a436f09ec6 explicit check for pattern discipline before code translation
haftmann
parents: 28562
diff changeset
   589
lemma size_union [simp]: "size (M + N::'a multiset) = size M + size N"
26178
nipkow
parents: 26176
diff changeset
   590
apply (unfold size_def)
nipkow
parents: 26176
diff changeset
   591
apply (subgoal_tac "count (M + N) = (\<lambda>a. count M a + count N a)")
nipkow
parents: 26176
diff changeset
   592
 prefer 2
nipkow
parents: 26176
diff changeset
   593
 apply (rule ext, simp)
nipkow
parents: 26176
diff changeset
   594
apply (simp (no_asm_simp) add: setsum_Un_nat setsum_addf setsum_count_Int)
nipkow
parents: 26176
diff changeset
   595
apply (subst Int_commute)
nipkow
parents: 26176
diff changeset
   596
apply (simp (no_asm_simp) add: setsum_count_Int)
nipkow
parents: 26176
diff changeset
   597
done
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   598
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   599
lemma size_eq_0_iff_empty [iff]: "(size M = 0) = (M = {#})"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   600
by (auto simp add: size_def multiset_eq_iff)
26016
f9d1bf2fc59c added multiset comprehension
nipkow
parents: 25759
diff changeset
   601
f9d1bf2fc59c added multiset comprehension
nipkow
parents: 25759
diff changeset
   602
lemma nonempty_has_size: "(S \<noteq> {#}) = (0 < size S)"
26178
nipkow
parents: 26176
diff changeset
   603
by (metis gr0I gr_implies_not0 size_empty size_eq_0_iff_empty)
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   604
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   605
lemma size_eq_Suc_imp_elem: "size M = Suc n ==> \<exists>a. a :# M"
26178
nipkow
parents: 26176
diff changeset
   606
apply (unfold size_def)
nipkow
parents: 26176
diff changeset
   607
apply (drule setsum_SucD)
nipkow
parents: 26176
diff changeset
   608
apply auto
nipkow
parents: 26176
diff changeset
   609
done
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   610
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   611
lemma size_eq_Suc_imp_eq_union:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   612
  assumes "size M = Suc n"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   613
  shows "\<exists>a N. M = N + {#a#}"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   614
proof -
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   615
  from assms obtain a where "a \<in># M"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   616
    by (erule size_eq_Suc_imp_elem [THEN exE])
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   617
  then have "M = M - {#a#} + {#a#}" by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   618
  then show ?thesis by blast
23611
65b168646309 more interpretations
nipkow
parents: 23373
diff changeset
   619
qed
15869
3aca7f05cd12 intersection
kleing
parents: 15867
diff changeset
   620
26016
f9d1bf2fc59c added multiset comprehension
nipkow
parents: 25759
diff changeset
   621
f9d1bf2fc59c added multiset comprehension
nipkow
parents: 25759
diff changeset
   622
subsection {* Induction and case splits *}
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   623
18258
836491e9b7d5 tuned induct proofs;
wenzelm
parents: 17778
diff changeset
   624
theorem multiset_induct [case_names empty add, induct type: multiset]:
48009
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   625
  assumes empty: "P {#}"
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   626
  assumes add: "\<And>M x. P M \<Longrightarrow> P (M + {#x#})"
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   627
  shows "P M"
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   628
proof (induct n \<equiv> "size M" arbitrary: M)
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   629
  case 0 thus "P M" by (simp add: empty)
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   630
next
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   631
  case (Suc k)
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   632
  obtain N x where "M = N + {#x#}"
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   633
    using `Suc k = size M` [symmetric]
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   634
    using size_eq_Suc_imp_eq_union by fast
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   635
  with Suc add show "P M" by simp
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   636
qed
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   637
25610
72e1563aee09 a fold operation for multisets + more lemmas
kleing
parents: 25595
diff changeset
   638
lemma multi_nonempty_split: "M \<noteq> {#} \<Longrightarrow> \<exists>A a. M = A + {#a#}"
26178
nipkow
parents: 26176
diff changeset
   639
by (induct M) auto
25610
72e1563aee09 a fold operation for multisets + more lemmas
kleing
parents: 25595
diff changeset
   640
72e1563aee09 a fold operation for multisets + more lemmas
kleing
parents: 25595
diff changeset
   641
lemma multiset_cases [cases type, case_names empty add]:
26178
nipkow
parents: 26176
diff changeset
   642
assumes em:  "M = {#} \<Longrightarrow> P"
nipkow
parents: 26176
diff changeset
   643
assumes add: "\<And>N x. M = N + {#x#} \<Longrightarrow> P"
nipkow
parents: 26176
diff changeset
   644
shows "P"
48009
9b9150033b5a shortened some proofs
huffman
parents: 48008
diff changeset
   645
using assms by (induct M) simp_all
25610
72e1563aee09 a fold operation for multisets + more lemmas
kleing
parents: 25595
diff changeset
   646
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   647
lemma multi_drop_mem_not_eq: "c \<in># B \<Longrightarrow> B - {#c#} \<noteq> B"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   648
by (cases "B = {#}") (auto dest: multi_member_split)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   649
26033
278025d5282d modified MCollect syntax
nipkow
parents: 26016
diff changeset
   650
lemma multiset_partition: "M = {# x:#M. P x #} + {# x:#M. \<not> P x #}"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   651
apply (subst multiset_eq_iff)
26178
nipkow
parents: 26176
diff changeset
   652
apply auto
nipkow
parents: 26176
diff changeset
   653
done
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   654
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   655
lemma mset_less_size: "(A::'a multiset) < B \<Longrightarrow> size A < size B"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   656
proof (induct A arbitrary: B)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   657
  case (empty M)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   658
  then have "M \<noteq> {#}" by (simp add: mset_less_empty_nonempty)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   659
  then obtain M' x where "M = M' + {#x#}" 
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   660
    by (blast dest: multi_nonempty_split)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   661
  then show ?case by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   662
next
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   663
  case (add S x T)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   664
  have IH: "\<And>B. S < B \<Longrightarrow> size S < size B" by fact
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   665
  have SxsubT: "S + {#x#} < T" by fact
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   666
  then have "x \<in># T" and "S < T" by (auto dest: mset_less_insertD)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   667
  then obtain T' where T: "T = T' + {#x#}" 
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   668
    by (blast dest: multi_member_split)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   669
  then have "S < T'" using SxsubT 
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   670
    by (blast intro: mset_less_add_bothsides)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   671
  then have "size S < size T'" using IH by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   672
  then show ?case using T by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   673
qed
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   674
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   675
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   676
subsubsection {* Strong induction and subset induction for multisets *}
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   677
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   678
text {* Well-foundedness of proper subset operator: *}
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   679
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   680
text {* proper multiset subset *}
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   681
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   682
definition
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   683
  mset_less_rel :: "('a multiset * 'a multiset) set" where
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   684
  "mset_less_rel = {(A,B). A < B}"
10249
e4d13d8a9011 Multisets (from HOL/Induct/Multiset and friends);
wenzelm
parents:
diff changeset
   685
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   686
lemma multiset_add_sub_el_shuffle: 
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   687
  assumes "c \<in># B" and "b \<noteq> c" 
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   688
  shows "B - {#c#} + {#b#} = B + {#b#} - {#c#}"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   689
proof -
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   690
  from `c \<in># B` obtain A where B: "B = A + {#c#}" 
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   691
    by (blast dest: multi_member_split)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   692
  have "A + {#b#} = A + {#b#} + {#c#} - {#c#}" by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   693
  then have "A + {#b#} = A + {#c#} + {#b#} - {#c#}" 
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   694
    by (simp add: add_ac)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   695
  then show ?thesis using B by simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   696
qed
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   697
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   698
lemma wf_mset_less_rel: "wf mset_less_rel"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   699
apply (unfold mset_less_rel_def)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   700
apply (rule wf_measure [THEN wf_subset, where f1=size])
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   701
apply (clarsimp simp: measure_def inv_image_def mset_less_size)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   702
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   703
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   704
text {* The induction rules: *}
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   705
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   706
lemma full_multiset_induct [case_names less]:
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   707
assumes ih: "\<And>B. \<forall>(A::'a multiset). A < B \<longrightarrow> P A \<Longrightarrow> P B"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   708
shows "P B"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   709
apply (rule wf_mset_less_rel [THEN wf_induct])
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   710
apply (rule ih, auto simp: mset_less_rel_def)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   711
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   712
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   713
lemma multi_subset_induct [consumes 2, case_names empty add]:
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   714
assumes "F \<le> A"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   715
  and empty: "P {#}"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   716
  and insert: "\<And>a F. a \<in># A \<Longrightarrow> P F \<Longrightarrow> P (F + {#a#})"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   717
shows "P F"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   718
proof -
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   719
  from `F \<le> A`
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   720
  show ?thesis
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   721
  proof (induct F)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   722
    show "P {#}" by fact
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   723
  next
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   724
    fix x F
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   725
    assume P: "F \<le> A \<Longrightarrow> P F" and i: "F + {#x#} \<le> A"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   726
    show "P (F + {#x#})"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   727
    proof (rule insert)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   728
      from i show "x \<in># A" by (auto dest: mset_le_insertD)
35268
04673275441a switched notations for pointwise and multiset order
haftmann
parents: 35028
diff changeset
   729
      from i have "F \<le> A" by (auto dest: mset_le_insertD)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   730
      with P show "P F" .
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   731
    qed
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   732
  qed
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   733
qed
26145
95670b6e1fa3 tuned document;
wenzelm
parents: 26143
diff changeset
   734
17161
57c69627d71a tuned some proofs;
wenzelm
parents: 15869
diff changeset
   735
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   736
subsection {* The fold combinator *}
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   737
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   738
definition fold :: "('a \<Rightarrow> 'b \<Rightarrow> 'b) \<Rightarrow> 'b \<Rightarrow> 'a multiset \<Rightarrow> 'b"
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   739
where
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   740
  "fold f s M = Finite_Set.fold (\<lambda>x. f x ^^ count M x) s (set_of M)"
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   741
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   742
lemma fold_mset_empty [simp]:
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   743
  "fold f s {#} = s"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   744
  by (simp add: fold_def)
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   745
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   746
context comp_fun_commute
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   747
begin
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   748
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   749
lemma fold_mset_insert:
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   750
  "fold f s (M + {#x#}) = f x (fold f s M)"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   751
proof -
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   752
  interpret mset: comp_fun_commute "\<lambda>y. f y ^^ count M y"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   753
    by (fact comp_fun_commute_funpow)
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   754
  interpret mset_union: comp_fun_commute "\<lambda>y. f y ^^ count (M + {#x#}) y"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   755
    by (fact comp_fun_commute_funpow)
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   756
  show ?thesis
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   757
  proof (cases "x \<in> set_of M")
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   758
    case False
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   759
    then have *: "count (M + {#x#}) x = 1" by simp
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   760
    from False have "Finite_Set.fold (\<lambda>y. f y ^^ count (M + {#x#}) y) s (set_of M) =
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   761
      Finite_Set.fold (\<lambda>y. f y ^^ count M y) s (set_of M)"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   762
      by (auto intro!: Finite_Set.fold_cong comp_fun_commute_funpow)
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   763
    with False * show ?thesis
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   764
      by (simp add: fold_def del: count_union)
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   765
  next
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   766
    case True
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   767
    def N \<equiv> "set_of M - {x}"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   768
    from N_def True have *: "set_of M = insert x N" "x \<notin> N" "finite N" by auto
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   769
    then have "Finite_Set.fold (\<lambda>y. f y ^^ count (M + {#x#}) y) s N =
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   770
      Finite_Set.fold (\<lambda>y. f y ^^ count M y) s N"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   771
      by (auto intro!: Finite_Set.fold_cong comp_fun_commute_funpow)
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   772
    with * show ?thesis by (simp add: fold_def del: count_union) simp
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   773
  qed
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   774
qed
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   775
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   776
corollary fold_mset_single [simp]:
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   777
  "fold f s {#x#} = f x s"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   778
proof -
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   779
  have "fold f s ({#} + {#x#}) = f x s" by (simp only: fold_mset_insert) simp
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   780
  then show ?thesis by simp
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   781
qed
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   782
51548
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
   783
lemma fold_mset_fun_left_comm:
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   784
  "f x (fold f s M) = fold f (f x s) M"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   785
  by (induct M) (simp_all add: fold_mset_insert fun_left_comm)
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   786
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   787
lemma fold_mset_union [simp]:
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   788
  "fold f s (M + N) = fold f (fold f s M) N"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   789
proof (induct M)
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   790
  case empty then show ?case by simp
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   791
next
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   792
  case (add M x)
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   793
  have "M + {#x#} + N = (M + N) + {#x#}"
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   794
    by (simp add: add_ac)
51548
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
   795
  with add show ?case by (simp add: fold_mset_insert fold_mset_fun_left_comm)
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   796
qed
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   797
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   798
lemma fold_mset_fusion:
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   799
  assumes "comp_fun_commute g"
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   800
  shows "(\<And>x y. h (g x y) = f x (h y)) \<Longrightarrow> h (fold g w A) = fold f (h w) A" (is "PROP ?P")
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   801
proof -
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   802
  interpret comp_fun_commute g by (fact assms)
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   803
  show "PROP ?P" by (induct A) auto
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   804
qed
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   805
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   806
end
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   807
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   808
text {*
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   809
  A note on code generation: When defining some function containing a
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   810
  subterm @{term "fold F"}, code generation is not automatic. When
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   811
  interpreting locale @{text left_commutative} with @{text F}, the
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   812
  would be code thms for @{const fold} become thms like
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   813
  @{term "fold F z {#} = z"} where @{text F} is not a pattern but
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   814
  contains defined symbols, i.e.\ is not a code thm. Hence a separate
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   815
  constant with its own code thms needs to be introduced for @{text
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   816
  F}. See the image operator below.
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   817
*}
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   818
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   819
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   820
subsection {* Image *}
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   821
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   822
definition image_mset :: "('a \<Rightarrow> 'b) \<Rightarrow> 'a multiset \<Rightarrow> 'b multiset" where
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
   823
  "image_mset f = fold (plus o single o f) {#}"
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   824
49823
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   825
lemma comp_fun_commute_mset_image:
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   826
  "comp_fun_commute (plus o single o f)"
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   827
proof
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   828
qed (simp add: add_ac fun_eq_iff)
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   829
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   830
lemma image_mset_empty [simp]: "image_mset f {#} = {#}"
49823
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   831
  by (simp add: image_mset_def)
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   832
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   833
lemma image_mset_single [simp]: "image_mset f {#x#} = {#f x#}"
49823
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   834
proof -
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   835
  interpret comp_fun_commute "plus o single o f"
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   836
    by (fact comp_fun_commute_mset_image)
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   837
  show ?thesis by (simp add: image_mset_def)
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   838
qed
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   839
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   840
lemma image_mset_union [simp]:
49823
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   841
  "image_mset f (M + N) = image_mset f M + image_mset f N"
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   842
proof -
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   843
  interpret comp_fun_commute "plus o single o f"
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   844
    by (fact comp_fun_commute_mset_image)
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   845
  show ?thesis by (induct N) (simp_all add: image_mset_def add_ac)
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   846
qed
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   847
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   848
corollary image_mset_insert:
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   849
  "image_mset f (M + {#a#}) = image_mset f M + {#f a#}"
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   850
  by simp
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   851
49823
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   852
lemma set_of_image_mset [simp]:
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   853
  "set_of (image_mset f M) = image f (set_of M)"
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   854
  by (induct M) simp_all
48040
4caf6cd063be add lemma set_of_image_mset
huffman
parents: 48023
diff changeset
   855
49823
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   856
lemma size_image_mset [simp]:
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   857
  "size (image_mset f M) = size M"
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   858
  by (induct M) simp_all
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   859
49823
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   860
lemma image_mset_is_empty_iff [simp]:
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   861
  "image_mset f M = {#} \<longleftrightarrow> M = {#}"
1c146fa7701e avoid global interpretation
haftmann
parents: 49822
diff changeset
   862
  by (cases M) auto
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   863
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   864
syntax
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   865
  "_comprehension1_mset" :: "'a \<Rightarrow> 'b \<Rightarrow> 'b multiset \<Rightarrow> 'a multiset"
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   866
      ("({#_/. _ :# _#})")
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   867
translations
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   868
  "{#e. x:#M#}" == "CONST image_mset (%x. e) M"
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   869
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   870
syntax
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   871
  "_comprehension2_mset" :: "'a \<Rightarrow> 'b \<Rightarrow> 'b multiset \<Rightarrow> bool \<Rightarrow> 'a multiset"
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   872
      ("({#_/ | _ :# _./ _#})")
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   873
translations
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   874
  "{#e | x:#M. P#}" => "{#e. x :# {# x:#M. P#}#}"
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   875
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   876
text {*
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   877
  This allows to write not just filters like @{term "{#x:#M. x<c#}"}
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   878
  but also images like @{term "{#x+x. x:#M #}"} and @{term [source]
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   879
  "{#x+x|x:#M. x<c#}"}, where the latter is currently displayed as
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   880
  @{term "{#x+x|x:#M. x<c#}"}.
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   881
*}
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   882
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   883
enriched_type image_mset: image_mset
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   884
proof -
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   885
  fix f g show "image_mset f \<circ> image_mset g = image_mset (f \<circ> g)"
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   886
  proof
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   887
    fix A
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   888
    show "(image_mset f \<circ> image_mset g) A = image_mset (f \<circ> g) A"
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   889
      by (induct A) simp_all
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   890
  qed
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   891
  show "image_mset id = id"
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   892
  proof
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   893
    fix A
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   894
    show "image_mset id A = id A"
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   895
      by (induct A) simp_all
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   896
  qed
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   897
qed
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   898
49717
56494eedf493 default simp rule for image under identity
haftmann
parents: 49394
diff changeset
   899
declare image_mset.identity [simp]
56494eedf493 default simp rule for image under identity
haftmann
parents: 49394
diff changeset
   900
48023
6dfe5e774012 reordered sections
huffman
parents: 48012
diff changeset
   901
51548
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
   902
subsection {* Further conversions *}
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   903
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   904
primrec multiset_of :: "'a list \<Rightarrow> 'a multiset" where
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   905
  "multiset_of [] = {#}" |
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   906
  "multiset_of (a # x) = multiset_of x + {# a #}"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   907
37107
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
   908
lemma in_multiset_in_set:
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
   909
  "x \<in># multiset_of xs \<longleftrightarrow> x \<in> set xs"
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
   910
  by (induct xs) simp_all
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
   911
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
   912
lemma count_multiset_of:
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
   913
  "count (multiset_of xs) x = length (filter (\<lambda>y. x = y) xs)"
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
   914
  by (induct xs) simp_all
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
   915
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   916
lemma multiset_of_zero_iff[simp]: "(multiset_of x = {#}) = (x = [])"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   917
by (induct x) auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   918
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   919
lemma multiset_of_zero_iff_right[simp]: "({#} = multiset_of x) = (x = [])"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   920
by (induct x) auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   921
40950
a370b0fb6f09 lemma multiset_of_rev
haftmann
parents: 40606
diff changeset
   922
lemma set_of_multiset_of[simp]: "set_of (multiset_of x) = set x"
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   923
by (induct x) auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   924
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   925
lemma mem_set_multiset_eq: "x \<in> set xs = (x :# multiset_of xs)"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   926
by (induct xs) auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   927
48012
b6e5e86a7303 shortened yet more multiset proofs;
huffman
parents: 48011
diff changeset
   928
lemma size_multiset_of [simp]: "size (multiset_of xs) = length xs"
b6e5e86a7303 shortened yet more multiset proofs;
huffman
parents: 48011
diff changeset
   929
  by (induct xs) simp_all
b6e5e86a7303 shortened yet more multiset proofs;
huffman
parents: 48011
diff changeset
   930
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   931
lemma multiset_of_append [simp]:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   932
  "multiset_of (xs @ ys) = multiset_of xs + multiset_of ys"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   933
  by (induct xs arbitrary: ys) (auto simp: add_ac)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   934
40303
2d507370e879 lemmas multiset_of_filter, sort_key_by_quicksort
haftmann
parents: 40250
diff changeset
   935
lemma multiset_of_filter:
2d507370e879 lemmas multiset_of_filter, sort_key_by_quicksort
haftmann
parents: 40250
diff changeset
   936
  "multiset_of (filter P xs) = {#x :# multiset_of xs. P x #}"
2d507370e879 lemmas multiset_of_filter, sort_key_by_quicksort
haftmann
parents: 40250
diff changeset
   937
  by (induct xs) simp_all
2d507370e879 lemmas multiset_of_filter, sort_key_by_quicksort
haftmann
parents: 40250
diff changeset
   938
40950
a370b0fb6f09 lemma multiset_of_rev
haftmann
parents: 40606
diff changeset
   939
lemma multiset_of_rev [simp]:
a370b0fb6f09 lemma multiset_of_rev
haftmann
parents: 40606
diff changeset
   940
  "multiset_of (rev xs) = multiset_of xs"
a370b0fb6f09 lemma multiset_of_rev
haftmann
parents: 40606
diff changeset
   941
  by (induct xs) simp_all
a370b0fb6f09 lemma multiset_of_rev
haftmann
parents: 40606
diff changeset
   942
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   943
lemma surj_multiset_of: "surj multiset_of"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   944
apply (unfold surj_def)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   945
apply (rule allI)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   946
apply (rule_tac M = y in multiset_induct)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   947
 apply auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   948
apply (rule_tac x = "x # xa" in exI)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   949
apply auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   950
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   951
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   952
lemma set_count_greater_0: "set x = {a. count (multiset_of x) a > 0}"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   953
by (induct x) auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   954
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   955
lemma distinct_count_atmost_1:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   956
  "distinct x = (! a. count (multiset_of x) a = (if a \<in> set x then 1 else 0))"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   957
apply (induct x, simp, rule iffI, simp_all)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   958
apply (rule conjI)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   959
apply (simp_all add: set_of_multiset_of [THEN sym] del: set_of_multiset_of)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   960
apply (erule_tac x = a in allE, simp, clarify)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   961
apply (erule_tac x = aa in allE, simp)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   962
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   963
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   964
lemma multiset_of_eq_setD:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   965
  "multiset_of xs = multiset_of ys \<Longrightarrow> set xs = set ys"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   966
by (rule) (auto simp add:multiset_eq_iff set_count_greater_0)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   967
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   968
lemma set_eq_iff_multiset_of_eq_distinct:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   969
  "distinct x \<Longrightarrow> distinct y \<Longrightarrow>
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   970
    (set x = set y) = (multiset_of x = multiset_of y)"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   971
by (auto simp: multiset_eq_iff distinct_count_atmost_1)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   972
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   973
lemma set_eq_iff_multiset_of_remdups_eq:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   974
   "(set x = set y) = (multiset_of (remdups x) = multiset_of (remdups y))"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   975
apply (rule iffI)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   976
apply (simp add: set_eq_iff_multiset_of_eq_distinct[THEN iffD1])
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   977
apply (drule distinct_remdups [THEN distinct_remdups
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   978
      [THEN set_eq_iff_multiset_of_eq_distinct [THEN iffD2]]])
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   979
apply simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   980
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   981
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   982
lemma multiset_of_compl_union [simp]:
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   983
  "multiset_of [x\<leftarrow>xs. P x] + multiset_of [x\<leftarrow>xs. \<not>P x] = multiset_of xs"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   984
  by (induct xs) (auto simp: add_ac)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   985
41069
6fabc0414055 name filter operation just filter (c.f. List.filter and list comprehension syntax)
haftmann
parents: 40968
diff changeset
   986
lemma count_multiset_of_length_filter:
39533
91a0ff0ff237 generalized lemmas multiset_of_insort, multiset_of_sort, properties_for_sort for *_key variants
haftmann
parents: 39314
diff changeset
   987
  "count (multiset_of xs) x = length (filter (\<lambda>y. x = y) xs)"
91a0ff0ff237 generalized lemmas multiset_of_insort, multiset_of_sort, properties_for_sort for *_key variants
haftmann
parents: 39314
diff changeset
   988
  by (induct xs) auto
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   989
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   990
lemma nth_mem_multiset_of: "i < length ls \<Longrightarrow> (ls ! i) :# multiset_of ls"
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   991
apply (induct ls arbitrary: i)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   992
 apply simp
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   993
apply (case_tac i)
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   994
 apply auto
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   995
done
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
   996
36903
489c1fbbb028 Multiset: renamed, added and tuned lemmas;
nipkow
parents: 36867
diff changeset
   997
lemma multiset_of_remove1[simp]:
489c1fbbb028 Multiset: renamed, added and tuned lemmas;
nipkow
parents: 36867
diff changeset
   998
  "multiset_of (remove1 a xs) = multiset_of xs - {#a#}"
39302
d7728f65b353 renamed lemmas: ext_iff -> fun_eq_iff, set_ext_iff -> set_eq_iff, set_ext -> set_eqI
nipkow
parents: 39301
diff changeset
   999
by (induct xs) (auto simp add: multiset_eq_iff)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
  1000
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
  1001
lemma multiset_of_eq_length:
37107
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
  1002
  assumes "multiset_of xs = multiset_of ys"
1535aa1c943a more lemmas
haftmann
parents: 37074
diff changeset
  1003
  shows "length xs = length ys"
48012
b6e5e86a7303 shortened yet more multiset proofs;
huffman
parents: 48011
diff changeset
  1004
  using assms by (metis size_multiset_of)
34943
e97b22500a5c cleanup of Multiset.thy: less duplication, tuned and simplified a couple of proofs, less historical organization of sections, conversion from associations lists to multisets, rudimentary code generation
haftmann
parents: 33102
diff changeset
  1005
39533
91a0ff0ff237 generalized lemmas multiset_of_insort, multiset_of_sort, properties_for_sort for *_key variants
haftmann
parents: 39314
diff changeset
  1006
lemma multiset_of_eq_length_filter:
91a0ff0ff237 generalized lemmas multiset_of_insort, multiset_of_sort, properties_for_sort for *_key variants
haftmann
parents: 39314
diff changeset
  1007
  assumes "multiset_of xs = multiset_of ys"
91a0ff0ff237 generalized lemmas multiset_of_insort, multiset_of_sort, properties_for_sort for *_key variants
haftmann
parents: 39314
diff changeset
  1008
  shows "length (filter (\<lambda>x. z = x) xs) = length (filter (\<lambda>y. z = y) ys)"
48012
b6e5e86a7303 shortened yet more multiset proofs;
huffman
parents: 48011
diff changeset
  1009
  using assms by (metis count_multiset_of)
39533
91a0ff0ff237 generalized lemmas multiset_of_insort, multiset_of_sort, properties_for_sort for *_key variants
haftmann
parents: 39314
diff changeset
  1010
45989
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1011
lemma fold_multiset_equiv:
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1012
  assumes f: "\<And>x y. x \<in> set xs \<Longrightarrow> y \<in> set xs \<Longrightarrow> f x \<circ> f y = f y \<circ> f x"
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1013
    and equiv: "multiset_of xs = multiset_of ys"
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
  1014
  shows "List.fold f xs = List.fold f ys"
46921
aa862ff8a8a9 some proof indentation;
wenzelm
parents: 46756
diff changeset
  1015
using f equiv [symmetric]
aa862ff8a8a9 some proof indentation;
wenzelm
parents: 46756
diff changeset
  1016
proof (induct xs arbitrary: ys)
45989
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1017
  case Nil then show ?case by simp
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1018
next
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1019
  case (Cons x xs)
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1020
  then have *: "set ys = set (x # xs)" by (blast dest: multiset_of_eq_setD)
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1021
  have "\<And>x y. x \<in> set ys \<Longrightarrow> y \<in> set ys \<Longrightarrow> f x \<circ> f y = f y \<circ> f x" 
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1022
    by (rule Cons.prems(1)) (simp_all add: *)
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1023
  moreover from * have "x \<in> set ys" by simp
49822
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
  1024
  ultimately have "List.fold f ys = List.fold f (remove1 x ys) \<circ> f x" by (fact fold_remove1_split)
0cfc1651be25 simplified construction of fold combinator on multisets;
haftmann
parents: 49717
diff changeset
  1025
  moreover from Cons.prems have "List.fold f xs = List.fold f (remove1 x ys)" by (auto intro: Cons.hyps)
45989
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1026
  ultimately show ?case by simp
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1027
qed
b39256df5f8a moved theorem requiring multisets from More_List to Multiset
haftmann
parents: 45866
diff changeset
  1028
51548
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1029
lemma multiset_of_insort [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1030
  "multiset_of (insort x xs) = multiset_of xs + {#x#}"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1031
  by (induct xs) (simp_all add: ac_simps)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1032
51600
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1033
lemma in_multiset_of:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1034
  "x \<in># multiset_of xs \<longleftrightarrow> x \<in> set xs"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1035
  by (induct xs) simp_all
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1036
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1037
lemma multiset_of_map:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1038
  "multiset_of (map f xs) = image_mset f (multiset_of xs)"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1039
  by (induct xs) simp_all
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1040
51548
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1041
definition multiset_of_set :: "'a set \<Rightarrow> 'a multiset"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1042
where
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1043
  "multiset_of_set = folding.F (\<lambda>x M. {#x#} + M) {#}"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1044
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1045
interpretation multiset_of_set!: folding "\<lambda>x M. {#x#} + M" "{#}"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1046
where
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1047
  "folding.F (\<lambda>x M. {#x#} + M) {#} = multiset_of_set"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1048
proof -
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1049
  interpret comp_fun_commute "\<lambda>x M. {#x#} + M" by default (simp add: fun_eq_iff ac_simps)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1050
  show "folding (\<lambda>x M. {#x#} + M)" by default (fact comp_fun_commute)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1051
  from multiset_of_set_def show "folding.F (\<lambda>x M. {#x#} + M) {#} = multiset_of_set" ..
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1052
qed
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1053
51600
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1054
lemma count_multiset_of_set [simp]:
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1055
  "finite A \<Longrightarrow> x \<in> A \<Longrightarrow> count (multiset_of_set A) x = 1" (is "PROP ?P")
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1056
  "\<not> finite A \<Longrightarrow> count (multiset_of_set A) x = 0" (is "PROP ?Q")
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1057
  "x \<notin> A \<Longrightarrow> count (multiset_of_set A) x = 0" (is "PROP ?R")
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1058
proof -
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1059
  { fix A
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1060
    assume "x \<notin> A"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1061
    have "count (multiset_of_set A) x = 0"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1062
    proof (cases "finite A")
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1063
      case False then show ?thesis by simp
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1064
    next
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1065
      case True from True `x \<notin> A` show ?thesis by (induct A) auto
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1066
    qed
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1067
  } note * = this
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1068
  then show "PROP ?P" "PROP ?Q" "PROP ?R"
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1069
  by (auto elim!: Set.set_insert)
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1070
qed -- {* TODO: maybe define @{const multiset_of_set} also in terms of @{const Abs_multiset} *}
197e25f13f0c default implementation of multisets by list with reasonable coverage of operations on multisets
haftmann
parents: 51599
diff changeset
  1071
51548
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1072
context linorder
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1073
begin
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1074
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1075
definition sorted_list_of_multiset :: "'a multiset \<Rightarrow> 'a list"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1076
where
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1077
  "sorted_list_of_multiset M = fold insort [] M"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1078
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1079
lemma sorted_list_of_multiset_empty [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1080
  "sorted_list_of_multiset {#} = []"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1081
  by (simp add: sorted_list_of_multiset_def)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1082
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1083
lemma sorted_list_of_multiset_singleton [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1084
  "sorted_list_of_multiset {#x#} = [x]"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1085
proof -
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1086
  interpret comp_fun_commute insort by (fact comp_fun_commute_insort)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1087
  show ?thesis by (simp add: sorted_list_of_multiset_def)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1088
qed
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1089
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1090
lemma sorted_list_of_multiset_insert [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1091
  "sorted_list_of_multiset (M + {#x#}) = List.insort x (sorted_list_of_multiset M)"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1092
proof -
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1093
  interpret comp_fun_commute insort by (fact comp_fun_commute_insort)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1094
  show ?thesis by (simp add: sorted_list_of_multiset_def)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1095
qed
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1096
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1097
end
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1098
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1099
lemma multiset_of_sorted_list_of_multiset [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1100
  "multiset_of (sorted_list_of_multiset M) = M"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1101
  by (induct M) simp_all
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1102
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1103
lemma sorted_list_of_multiset_multiset_of [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1104
  "sorted_list_of_multiset (multiset_of xs) = sort xs"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1105
  by (induct xs) simp_all
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1106
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1107
lemma finite_set_of_multiset_of_set:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1108
  assumes "finite A"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1109
  shows "set_of (multiset_of_set A) = A"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1110
  using assms by (induct A) simp_all
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1111
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1112
lemma infinite_set_of_multiset_of_set:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1113
  assumes "\<not> finite A"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1114
  shows "set_of (multiset_of_set A) = {}"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1115
  using assms by simp
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1116
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1117
lemma set_sorted_list_of_multiset [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1118
  "set (sorted_list_of_multiset M) = set_of M"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1119
  by (induct M) (simp_all add: set_insort)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1120
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1121
lemma sorted_list_of_multiset_of_set [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1122
  "sorted_list_of_multiset (multiset_of_set A) = sorted_list_of_set A"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1123
  by (cases "finite A") (induct A rule: finite_induct, simp_all add: ac_simps)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1124
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1125
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1126
subsection {* Big operators *}
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1127
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1128
no_notation times (infixl "*" 70)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1129
no_notation Groups.one ("1")
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1130
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1131
locale comm_monoid_mset = comm_monoid
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1132
begin
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1133
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1134
definition F :: "'a multiset \<Rightarrow> 'a"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1135
where
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1136
  eq_fold: "F M = Multiset.fold f 1 M"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1137
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1138
lemma empty [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1139
  "F {#} = 1"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1140
  by (simp add: eq_fold)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1141
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1142
lemma singleton [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1143
  "F {#x#} = x"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1144
proof -
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1145
  interpret comp_fun_commute
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1146
    by default (simp add: fun_eq_iff left_commute)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1147
  show ?thesis by (simp add: eq_fold)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1148
qed
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1149
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1150
lemma union [simp]:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1151
  "F (M + N) = F M * F N"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1152
proof -
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1153
  interpret comp_fun_commute f
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1154
    by default (simp add: fun_eq_iff left_commute)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1155
  show ?thesis by (induct N) (simp_all add: left_commute eq_fold)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1156
qed
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1157
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1158
end
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1159
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1160
notation times (infixl "*" 70)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1161
notation Groups.one ("1")
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1162
54868
bab6cade3cc5 prefer target-style syntaxx for sublocale
haftmann
parents: 54295
diff changeset
  1163
context comm_monoid_add
bab6cade3cc5 prefer target-style syntaxx for sublocale
haftmann
parents: 54295
diff changeset
  1164
begin
bab6cade3cc5 prefer target-style syntaxx for sublocale
haftmann
parents: 54295
diff changeset
  1165
bab6cade3cc5 prefer target-style syntaxx for sublocale
haftmann
parents: 54295
diff changeset
  1166
definition msetsum :: "'a multiset \<Rightarrow> 'a"
51548
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1167
where
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1168
  "msetsum = comm_monoid_mset.F plus 0"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1169
54868
bab6cade3cc5 prefer target-style syntaxx for sublocale
haftmann
parents: 54295
diff changeset
  1170
sublocale msetsum!: comm_monoid_mset plus 0
51548
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1171
where
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1172
  "comm_monoid_mset.F plus 0 = msetsum"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1173
proof -
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1174
  show "comm_monoid_mset plus 0" ..
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1175
  from msetsum_def show "comm_monoid_mset.F plus 0 = msetsum" ..
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1176
qed
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1177
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1178
lemma setsum_unfold_msetsum:
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1179
  "setsum f A = msetsum (image_mset f (multiset_of_set A))"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1180
  by (cases "finite A") (induct A rule: finite_induct, simp_all)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1181
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1182
abbreviation msetsum_image :: "('b \<Rightarrow> 'a) \<Rightarrow> 'b multiset \<Rightarrow> 'a"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1183
where
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1184
  "msetsum_image f M \<equiv> msetsum (image_mset f M)"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1185
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1186
end
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1187
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1188
syntax
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1189
  "_msetsum_image" :: "pttrn \<Rightarrow> 'b set \<Rightarrow> 'a \<Rightarrow> 'a::comm_monoid_add" 
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1190
      ("(3SUM _:#_. _)" [0, 51, 10] 10)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1191
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1192
syntax (xsymbols)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1193
  "_msetsum_image" :: "pttrn \<Rightarrow> 'b set \<Rightarrow> 'a \<Rightarrow> 'a::comm_monoid_add" 
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1194
      ("(3\<Sum>_:#_. _)" [0, 51, 10] 10)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1195
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1196
syntax (HTML output)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1197
  "_msetsum_image" :: "pttrn \<Rightarrow> 'b set \<Rightarrow> 'a \<Rightarrow> 'a::comm_monoid_add" 
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1198
      ("(3\<Sum>_\<in>#_. _)" [0, 51, 10] 10)
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1199
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1200
translations
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1201
  "SUM i :# A. b" == "CONST msetsum_image (\<lambda>i. b) A"
757fa47af981 centralized various multiset operations in theory multiset;
haftmann
parents: 51161
diff changeset
  1202
54868
bab6cade3cc5 prefer target-style syntaxx for sublocale
haftmann
parents: