src/HOL/Nat_Transfer.thy
author webertj
Fri, 19 Oct 2012 15:12:52 +0200
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permissions -rw-r--r--
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(* Authors: Jeremy Avigad and Amine Chaieb *)
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header {* Generic transfer machinery;  specific transfer from nats to ints and back. *}
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theory Nat_Transfer
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imports Int
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begin
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subsection {* Generic transfer machinery *}
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definition transfer_morphism:: "('b \<Rightarrow> 'a) \<Rightarrow> ('b \<Rightarrow> bool) \<Rightarrow> bool"
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  where "transfer_morphism f A \<longleftrightarrow> True"
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lemma transfer_morphismI[intro]: "transfer_morphism f A"
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  by (simp add: transfer_morphism_def)
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ML_file "Tools/legacy_transfer.ML"
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setup Legacy_Transfer.setup
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subsection {* Set up transfer from nat to int *}
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text {* set up transfer direction *}
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lemma transfer_morphism_nat_int: "transfer_morphism nat (op <= (0::int))" ..
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declare transfer_morphism_nat_int [transfer add
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  mode: manual
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  return: nat_0_le
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  labels: nat_int
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]
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text {* basic functions and relations *}
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lemma transfer_nat_int_numerals [transfer key: transfer_morphism_nat_int]:
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    "(0::nat) = nat 0"
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    "(1::nat) = nat 1"
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    "(2::nat) = nat 2"
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    "(3::nat) = nat 3"
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  by auto
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definition
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  tsub :: "int \<Rightarrow> int \<Rightarrow> int"
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where
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  "tsub x y = (if x >= y then x - y else 0)"
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lemma tsub_eq: "x >= y \<Longrightarrow> tsub x y = x - y"
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  by (simp add: tsub_def)
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lemma transfer_nat_int_functions [transfer key: transfer_morphism_nat_int]:
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    "(x::int) >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow> (nat x) + (nat y) = nat (x + y)"
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    "(x::int) >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow> (nat x) * (nat y) = nat (x * y)"
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    "(x::int) >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow> (nat x) - (nat y) = nat (tsub x y)"
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    "(x::int) >= 0 \<Longrightarrow> (nat x)^n = nat (x^n)"
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  by (auto simp add: eq_nat_nat_iff nat_mult_distrib
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      nat_power_eq tsub_def)
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lemma transfer_nat_int_function_closures [transfer key: transfer_morphism_nat_int]:
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    "(x::int) >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow> x + y >= 0"
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    "(x::int) >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow> x * y >= 0"
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    "(x::int) >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow> tsub x y >= 0"
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    "(x::int) >= 0 \<Longrightarrow> x^n >= 0"
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    "(0::int) >= 0"
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    "(1::int) >= 0"
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    "(2::int) >= 0"
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    "(3::int) >= 0"
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    "int z >= 0"
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  by (auto simp add: zero_le_mult_iff tsub_def)
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lemma transfer_nat_int_relations [transfer key: transfer_morphism_nat_int]:
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    "x >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow>
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      (nat (x::int) = nat y) = (x = y)"
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    "x >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow>
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      (nat (x::int) < nat y) = (x < y)"
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    "x >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow>
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      (nat (x::int) <= nat y) = (x <= y)"
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    "x >= 0 \<Longrightarrow> y >= 0 \<Longrightarrow>
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      (nat (x::int) dvd nat y) = (x dvd y)"
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  by (auto simp add: zdvd_int)
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text {* first-order quantifiers *}
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lemma all_nat: "(\<forall>x. P x) \<longleftrightarrow> (\<forall>x\<ge>0. P (nat x))"
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  by (simp split add: split_nat)
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lemma ex_nat: "(\<exists>x. P x) \<longleftrightarrow> (\<exists>x. 0 \<le> x \<and> P (nat x))"
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proof
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  assume "\<exists>x. P x"
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  then obtain x where "P x" ..
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  then have "int x \<ge> 0 \<and> P (nat (int x))" by simp
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  then show "\<exists>x\<ge>0. P (nat x)" ..
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next
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  assume "\<exists>x\<ge>0. P (nat x)"
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  then show "\<exists>x. P x" by auto
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qed
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lemma transfer_nat_int_quantifiers [transfer key: transfer_morphism_nat_int]:
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    "(ALL (x::nat). P x) = (ALL (x::int). x >= 0 \<longrightarrow> P (nat x))"
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    "(EX (x::nat). P x) = (EX (x::int). x >= 0 & P (nat x))"
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  by (rule all_nat, rule ex_nat)
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(* should we restrict these? *)
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lemma all_cong: "(\<And>x. Q x \<Longrightarrow> P x = P' x) \<Longrightarrow>
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    (ALL x. Q x \<longrightarrow> P x) = (ALL x. Q x \<longrightarrow> P' x)"
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  by auto
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lemma ex_cong: "(\<And>x. Q x \<Longrightarrow> P x = P' x) \<Longrightarrow>
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    (EX x. Q x \<and> P x) = (EX x. Q x \<and> P' x)"
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  by auto
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declare transfer_morphism_nat_int [transfer add
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  cong: all_cong ex_cong]
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text {* if *}
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lemma nat_if_cong [transfer key: transfer_morphism_nat_int]:
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  "(if P then (nat x) else (nat y)) = nat (if P then x else y)"
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  by auto
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text {* operations with sets *}
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definition
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  nat_set :: "int set \<Rightarrow> bool"
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where
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  "nat_set S = (ALL x:S. x >= 0)"
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lemma transfer_nat_int_set_functions:
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    "card A = card (int ` A)"
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    "{} = nat ` ({}::int set)"
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    "A Un B = nat ` (int ` A Un int ` B)"
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    "A Int B = nat ` (int ` A Int int ` B)"
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    "{x. P x} = nat ` {x. x >= 0 & P(nat x)}"
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  apply (rule card_image [symmetric])
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  apply (auto simp add: inj_on_def image_def)
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  apply (rule_tac x = "int x" in bexI)
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  apply auto
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  apply (rule_tac x = "int x" in bexI)
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  apply auto
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  apply (rule_tac x = "int x" in bexI)
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  apply auto
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  apply (rule_tac x = "int x" in exI)
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  apply auto
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done
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lemma transfer_nat_int_set_function_closures:
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    "nat_set {}"
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    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> nat_set (A Un B)"
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    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> nat_set (A Int B)"
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    "nat_set {x. x >= 0 & P x}"
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    "nat_set (int ` C)"
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    "nat_set A \<Longrightarrow> x : A \<Longrightarrow> x >= 0" (* does it hurt to turn this on? *)
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  unfolding nat_set_def apply auto
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done
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lemma transfer_nat_int_set_relations:
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    "(finite A) = (finite (int ` A))"
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    "(x : A) = (int x : int ` A)"
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    "(A = B) = (int ` A = int ` B)"
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    "(A < B) = (int ` A < int ` B)"
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    "(A <= B) = (int ` A <= int ` B)"
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  apply (rule iffI)
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  apply (erule finite_imageI)
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  apply (erule finite_imageD)
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  apply (auto simp add: image_def set_eq_iff inj_on_def)
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  apply (drule_tac x = "int x" in spec, auto)
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  apply (drule_tac x = "int x" in spec, auto)
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  apply (drule_tac x = "int x" in spec, auto)
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done
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lemma transfer_nat_int_set_return_embed: "nat_set A \<Longrightarrow>
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    (int ` nat ` A = A)"
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  by (auto simp add: nat_set_def image_def)
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lemma transfer_nat_int_set_cong: "(!!x. x >= 0 \<Longrightarrow> P x = P' x) \<Longrightarrow>
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    {(x::int). x >= 0 & P x} = {x. x >= 0 & P' x}"
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  by auto
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declare transfer_morphism_nat_int [transfer add
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  return: transfer_nat_int_set_functions
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    transfer_nat_int_set_function_closures
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    transfer_nat_int_set_relations
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    transfer_nat_int_set_return_embed
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  cong: transfer_nat_int_set_cong
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]
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text {* setsum and setprod *}
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(* this handles the case where the *domain* of f is nat *)
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lemma transfer_nat_int_sum_prod:
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    "setsum f A = setsum (%x. f (nat x)) (int ` A)"
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    "setprod f A = setprod (%x. f (nat x)) (int ` A)"
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  apply (subst setsum_reindex)
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  apply (unfold inj_on_def, auto)
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  apply (subst setprod_reindex)
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  apply (unfold inj_on_def o_def, auto)
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done
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(* this handles the case where the *range* of f is nat *)
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lemma transfer_nat_int_sum_prod2:
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    "setsum f A = nat(setsum (%x. int (f x)) A)"
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    "setprod f A = nat(setprod (%x. int (f x)) A)"
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  apply (subst int_setsum [symmetric])
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  apply auto
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  apply (subst int_setprod [symmetric])
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  apply auto
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done
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lemma transfer_nat_int_sum_prod_closure:
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    "nat_set A \<Longrightarrow> (!!x. x >= 0 \<Longrightarrow> f x >= (0::int)) \<Longrightarrow> setsum f A >= 0"
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    "nat_set A \<Longrightarrow> (!!x. x >= 0 \<Longrightarrow> f x >= (0::int)) \<Longrightarrow> setprod f A >= 0"
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  unfolding nat_set_def
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  apply (rule setsum_nonneg)
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  apply auto
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  apply (rule setprod_nonneg)
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  apply auto
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done
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(* this version doesn't work, even with nat_set A \<Longrightarrow>
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      x : A \<Longrightarrow> x >= 0 turned on. Why not?
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  also: what does =simp=> do?
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lemma transfer_nat_int_sum_prod_closure:
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    "(!!x. x : A  ==> f x >= (0::int)) \<Longrightarrow> setsum f A >= 0"
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    "(!!x. x : A  ==> f x >= (0::int)) \<Longrightarrow> setprod f A >= 0"
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  unfolding nat_set_def simp_implies_def
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  apply (rule setsum_nonneg)
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  apply auto
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  apply (rule setprod_nonneg)
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  apply auto
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done
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*)
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(* Making A = B in this lemma doesn't work. Why not?
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   Also, why aren't setsum_cong and setprod_cong enough,
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   with the previously mentioned rule turned on? *)
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lemma transfer_nat_int_sum_prod_cong:
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    "A = B \<Longrightarrow> nat_set B \<Longrightarrow> (!!x. x >= 0 \<Longrightarrow> f x = g x) \<Longrightarrow>
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      setsum f A = setsum g B"
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    "A = B \<Longrightarrow> nat_set B \<Longrightarrow> (!!x. x >= 0 \<Longrightarrow> f x = g x) \<Longrightarrow>
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      setprod f A = setprod g B"
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  unfolding nat_set_def
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  apply (subst setsum_cong, assumption)
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  apply auto [2]
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  apply (subst setprod_cong, assumption, auto)
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done
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declare transfer_morphism_nat_int [transfer add
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  return: transfer_nat_int_sum_prod transfer_nat_int_sum_prod2
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    transfer_nat_int_sum_prod_closure
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  cong: transfer_nat_int_sum_prod_cong]
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subsection {* Set up transfer from int to nat *}
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text {* set up transfer direction *}
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lemma transfer_morphism_int_nat: "transfer_morphism int (\<lambda>n. True)" ..
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declare transfer_morphism_int_nat [transfer add
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  mode: manual
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  return: nat_int
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  labels: int_nat
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]
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text {* basic functions and relations *}
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definition
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  is_nat :: "int \<Rightarrow> bool"
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where
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  "is_nat x = (x >= 0)"
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lemma transfer_int_nat_numerals:
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    "0 = int 0"
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    "1 = int 1"
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    "2 = int 2"
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    "3 = int 3"
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  by auto
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lemma transfer_int_nat_functions:
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    "(int x) + (int y) = int (x + y)"
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    "(int x) * (int y) = int (x * y)"
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    "tsub (int x) (int y) = int (x - y)"
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    "(int x)^n = int (x^n)"
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  by (auto simp add: int_mult tsub_def int_power)
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lemma transfer_int_nat_function_closures:
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    "is_nat x \<Longrightarrow> is_nat y \<Longrightarrow> is_nat (x + y)"
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    "is_nat x \<Longrightarrow> is_nat y \<Longrightarrow> is_nat (x * y)"
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    "is_nat x \<Longrightarrow> is_nat y \<Longrightarrow> is_nat (tsub x y)"
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    "is_nat x \<Longrightarrow> is_nat (x^n)"
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    "is_nat 0"
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    "is_nat 1"
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    "is_nat 2"
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    "is_nat 3"
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    "is_nat (int z)"
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  by (simp_all only: is_nat_def transfer_nat_int_function_closures)
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lemma transfer_int_nat_relations:
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   307
    "(int x = int y) = (x = y)"
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   308
    "(int x < int y) = (x < y)"
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   309
    "(int x <= int y) = (x <= y)"
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   310
    "(int x dvd int y) = (x dvd y)"
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   311
  by (auto simp add: zdvd_int)
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   312
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   313
declare transfer_morphism_int_nat [transfer add return:
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  transfer_int_nat_numerals
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parents:
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   315
  transfer_int_nat_functions
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   316
  transfer_int_nat_function_closures
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   317
  transfer_int_nat_relations
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   318
]
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   319
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   320
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   321
text {* first-order quantifiers *}
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   322
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   323
lemma transfer_int_nat_quantifiers:
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   324
    "(ALL (x::int) >= 0. P x) = (ALL (x::nat). P (int x))"
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parents:
diff changeset
   325
    "(EX (x::int) >= 0. P x) = (EX (x::nat). P (int x))"
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parents:
diff changeset
   326
  apply (subst all_nat)
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parents:
diff changeset
   327
  apply auto [1]
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parents:
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   328
  apply (subst ex_nat)
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parents:
diff changeset
   329
  apply auto
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parents:
diff changeset
   330
done
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diff changeset
   331
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   332
declare transfer_morphism_int_nat [transfer add
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   333
  return: transfer_int_nat_quantifiers]
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parents:
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   334
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   335
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   336
text {* if *}
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   337
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   338
lemma int_if_cong: "(if P then (int x) else (int y)) =
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   339
    int (if P then x else y)"
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   340
  by auto
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   341
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   342
declare transfer_morphism_int_nat [transfer add return: int_if_cong]
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   343
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   344
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   345
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   346
text {* operations with sets *}
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   347
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   348
lemma transfer_int_nat_set_functions:
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   349
    "nat_set A \<Longrightarrow> card A = card (nat ` A)"
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   350
    "{} = int ` ({}::nat set)"
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   351
    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> A Un B = int ` (nat ` A Un nat ` B)"
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parents:
diff changeset
   352
    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> A Int B = int ` (nat ` A Int nat ` B)"
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parents:
diff changeset
   353
    "{x. x >= 0 & P x} = int ` {x. P(int x)}"
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parents:
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   354
       (* need all variants of these! *)
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parents:
diff changeset
   355
  by (simp_all only: is_nat_def transfer_nat_int_set_functions
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parents:
diff changeset
   356
          transfer_nat_int_set_function_closures
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parents:
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   357
          transfer_nat_int_set_return_embed nat_0_le
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parents:
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   358
          cong: transfer_nat_int_set_cong)
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parents:
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   359
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   360
lemma transfer_int_nat_set_function_closures:
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   361
    "nat_set {}"
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parents:
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   362
    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> nat_set (A Un B)"
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parents:
diff changeset
   363
    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> nat_set (A Int B)"
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parents:
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   364
    "nat_set {x. x >= 0 & P x}"
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parents:
diff changeset
   365
    "nat_set (int ` C)"
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parents:
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   366
    "nat_set A \<Longrightarrow> x : A \<Longrightarrow> is_nat x"
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parents:
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   367
  by (simp_all only: transfer_nat_int_set_function_closures is_nat_def)
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parents:
diff changeset
   368
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   369
lemma transfer_int_nat_set_relations:
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   370
    "nat_set A \<Longrightarrow> finite A = finite (nat ` A)"
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diff changeset
   371
    "is_nat x \<Longrightarrow> nat_set A \<Longrightarrow> (x : A) = (nat x : nat ` A)"
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parents:
diff changeset
   372
    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> (A = B) = (nat ` A = nat ` B)"
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parents:
diff changeset
   373
    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> (A < B) = (nat ` A < nat ` B)"
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parents:
diff changeset
   374
    "nat_set A \<Longrightarrow> nat_set B \<Longrightarrow> (A <= B) = (nat ` A <= nat ` B)"
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parents:
diff changeset
   375
  by (simp_all only: is_nat_def transfer_nat_int_set_relations
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huffman
parents:
diff changeset
   376
    transfer_nat_int_set_return_embed nat_0_le)
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parents:
diff changeset
   377
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diff changeset
   378
lemma transfer_int_nat_set_return_embed: "nat ` int ` A = A"
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huffman
parents:
diff changeset
   379
  by (simp only: transfer_nat_int_set_relations
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huffman
parents:
diff changeset
   380
    transfer_nat_int_set_function_closures
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huffman
parents:
diff changeset
   381
    transfer_nat_int_set_return_embed nat_0_le)
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huffman
parents:
diff changeset
   382
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parents:
diff changeset
   383
lemma transfer_int_nat_set_cong: "(!!x. P x = P' x) \<Longrightarrow>
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huffman
parents:
diff changeset
   384
    {(x::nat). P x} = {x. P' x}"
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huffman
parents:
diff changeset
   385
  by auto
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huffman
parents:
diff changeset
   386
35644
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diff changeset
   387
declare transfer_morphism_int_nat [transfer add
31708
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diff changeset
   388
  return: transfer_int_nat_set_functions
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huffman
parents:
diff changeset
   389
    transfer_int_nat_set_function_closures
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huffman
parents:
diff changeset
   390
    transfer_int_nat_set_relations
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huffman
parents:
diff changeset
   391
    transfer_int_nat_set_return_embed
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huffman
parents:
diff changeset
   392
  cong: transfer_int_nat_set_cong
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huffman
parents:
diff changeset
   393
]
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parents:
diff changeset
   394
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   395
33318
ddd97d9dfbfb moved Nat_Transfer before Divides; distributed Nat_Transfer setup accordingly
haftmann
parents: 32558
diff changeset
   396
text {* setsum and setprod *}
31708
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diff changeset
   397
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huffman
parents:
diff changeset
   398
(* this handles the case where the *domain* of f is int *)
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huffman
parents:
diff changeset
   399
lemma transfer_int_nat_sum_prod:
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huffman
parents:
diff changeset
   400
    "nat_set A \<Longrightarrow> setsum f A = setsum (%x. f (int x)) (nat ` A)"
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   401
    "nat_set A \<Longrightarrow> setprod f A = setprod (%x. f (int x)) (nat ` A)"
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   402
  apply (subst setsum_reindex)
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huffman
parents:
diff changeset
   403
  apply (unfold inj_on_def nat_set_def, auto simp add: eq_nat_nat_iff)
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   404
  apply (subst setprod_reindex)
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   405
  apply (unfold inj_on_def nat_set_def o_def, auto simp add: eq_nat_nat_iff
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   406
            cong: setprod_cong)
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   407
done
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   408
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   409
(* this handles the case where the *range* of f is int *)
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huffman
parents:
diff changeset
   410
lemma transfer_int_nat_sum_prod2:
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huffman
parents:
diff changeset
   411
    "(!!x. x:A \<Longrightarrow> is_nat (f x)) \<Longrightarrow> setsum f A = int(setsum (%x. nat (f x)) A)"
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   412
    "(!!x. x:A \<Longrightarrow> is_nat (f x)) \<Longrightarrow>
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   413
      setprod f A = int(setprod (%x. nat (f x)) A)"
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   414
  unfolding is_nat_def
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   415
  apply (subst int_setsum, auto)
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   416
  apply (subst int_setprod, auto simp add: cong: setprod_cong)
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   417
done
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   418
35644
d20cf282342e transfer: avoid camel case
haftmann
parents: 35551
diff changeset
   419
declare transfer_morphism_int_nat [transfer add
31708
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huffman
parents:
diff changeset
   420
  return: transfer_int_nat_sum_prod transfer_int_nat_sum_prod2
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   421
  cong: setsum_cong setprod_cong]
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   422
a3fce678c320 add NatTransfer.thy, needed for new GCD library
huffman
parents:
diff changeset
   423
end