author | huffman |
Fri, 04 May 2012 17:12:37 +0200 | |
changeset 47889 | 29212a4bb866 |
parent 47777 | f29e7dcd7c40 |
child 47936 | 756f30eac792 |
permissions | -rw-r--r-- |
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(* Title: HOL/Lifting.thy |
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Author: Brian Huffman and Ondrej Kuncar |
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Author: Cezary Kaliszyk and Christian Urban |
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*) |
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header {* Lifting package *} |
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theory Lifting |
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imports Plain Equiv_Relations Transfer |
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keywords |
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"print_quotmaps" "print_quotients" :: diag and |
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"lift_definition" :: thy_goal and |
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"setup_lifting" :: thy_decl |
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uses |
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("Tools/Lifting/lifting_util.ML") |
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("Tools/Lifting/lifting_info.ML") |
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("Tools/Lifting/lifting_term.ML") |
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("Tools/Lifting/lifting_def.ML") |
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("Tools/Lifting/lifting_setup.ML") |
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begin |
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subsection {* Function map *} |
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notation map_fun (infixr "--->" 55) |
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lemma map_fun_id: |
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"(id ---> id) = id" |
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by (simp add: fun_eq_iff) |
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subsection {* Quotient Predicate *} |
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definition |
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"Quotient R Abs Rep T \<longleftrightarrow> |
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(\<forall>a. Abs (Rep a) = a) \<and> |
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(\<forall>a. R (Rep a) (Rep a)) \<and> |
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(\<forall>r s. R r s \<longleftrightarrow> R r r \<and> R s s \<and> Abs r = Abs s) \<and> |
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T = (\<lambda>x y. R x x \<and> Abs x = y)" |
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lemma QuotientI: |
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assumes "\<And>a. Abs (Rep a) = a" |
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and "\<And>a. R (Rep a) (Rep a)" |
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and "\<And>r s. R r s \<longleftrightarrow> R r r \<and> R s s \<and> Abs r = Abs s" |
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and "T = (\<lambda>x y. R x x \<and> Abs x = y)" |
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shows "Quotient R Abs Rep T" |
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using assms unfolding Quotient_def by blast |
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context |
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fixes R Abs Rep T |
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assumes a: "Quotient R Abs Rep T" |
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begin |
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lemma Quotient_abs_rep: "Abs (Rep a) = a" |
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using a unfolding Quotient_def |
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by simp |
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lemma Quotient_rep_reflp: "R (Rep a) (Rep a)" |
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using a unfolding Quotient_def |
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by blast |
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lemma Quotient_rel: |
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"R r r \<and> R s s \<and> Abs r = Abs s \<longleftrightarrow> R r s" -- {* orientation does not loop on rewriting *} |
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using a unfolding Quotient_def |
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by blast |
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lemma Quotient_cr_rel: "T = (\<lambda>x y. R x x \<and> Abs x = y)" |
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using a unfolding Quotient_def |
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by blast |
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lemma Quotient_refl1: "R r s \<Longrightarrow> R r r" |
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using a unfolding Quotient_def |
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by fast |
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lemma Quotient_refl2: "R r s \<Longrightarrow> R s s" |
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using a unfolding Quotient_def |
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by fast |
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lemma Quotient_rel_rep: "R (Rep a) (Rep b) \<longleftrightarrow> a = b" |
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using a unfolding Quotient_def |
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by metis |
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lemma Quotient_rep_abs: "R r r \<Longrightarrow> R (Rep (Abs r)) r" |
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using a unfolding Quotient_def |
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by blast |
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lemma Quotient_rel_abs: "R r s \<Longrightarrow> Abs r = Abs s" |
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using a unfolding Quotient_def |
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by blast |
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lemma Quotient_symp: "symp R" |
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using a unfolding Quotient_def using sympI by (metis (full_types)) |
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lemma Quotient_transp: "transp R" |
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using a unfolding Quotient_def using transpI by (metis (full_types)) |
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lemma Quotient_part_equivp: "part_equivp R" |
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by (metis Quotient_rep_reflp Quotient_symp Quotient_transp part_equivpI) |
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end |
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lemma identity_quotient: "Quotient (op =) id id (op =)" |
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unfolding Quotient_def by simp |
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text {* TODO: Use one of these alternatives as the real definition. *} |
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lemma Quotient_alt_def: |
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"Quotient R Abs Rep T \<longleftrightarrow> |
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(\<forall>a b. T a b \<longrightarrow> Abs a = b) \<and> |
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(\<forall>b. T (Rep b) b) \<and> |
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(\<forall>x y. R x y \<longleftrightarrow> T x (Abs x) \<and> T y (Abs y) \<and> Abs x = Abs y)" |
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apply safe |
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apply (simp (no_asm_use) only: Quotient_def, fast) |
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apply (simp (no_asm_use) only: Quotient_def, fast) |
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apply (simp (no_asm_use) only: Quotient_def, fast) |
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apply (simp (no_asm_use) only: Quotient_def, fast) |
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apply (simp (no_asm_use) only: Quotient_def, fast) |
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apply (simp (no_asm_use) only: Quotient_def, fast) |
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apply (rule QuotientI) |
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apply simp |
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apply metis |
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apply simp |
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apply (rule ext, rule ext, metis) |
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done |
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lemma Quotient_alt_def2: |
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"Quotient R Abs Rep T \<longleftrightarrow> |
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(\<forall>a b. T a b \<longrightarrow> Abs a = b) \<and> |
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(\<forall>b. T (Rep b) b) \<and> |
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(\<forall>x y. R x y \<longleftrightarrow> T x (Abs y) \<and> T y (Abs x))" |
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unfolding Quotient_alt_def by (safe, metis+) |
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lemma Quotient_alt_def3: |
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"Quotient R Abs Rep T \<longleftrightarrow> |
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(\<forall>a b. T a b \<longrightarrow> Abs a = b) \<and> (\<forall>b. T (Rep b) b) \<and> |
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(\<forall>x y. R x y \<longleftrightarrow> (\<exists>z. T x z \<and> T y z))" |
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unfolding Quotient_alt_def2 by (safe, metis+) |
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lemma Quotient_alt_def4: |
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"Quotient R Abs Rep T \<longleftrightarrow> |
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(\<forall>a b. T a b \<longrightarrow> Abs a = b) \<and> (\<forall>b. T (Rep b) b) \<and> R = T OO conversep T" |
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unfolding Quotient_alt_def3 fun_eq_iff by auto |
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lemma fun_quotient: |
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assumes 1: "Quotient R1 abs1 rep1 T1" |
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assumes 2: "Quotient R2 abs2 rep2 T2" |
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shows "Quotient (R1 ===> R2) (rep1 ---> abs2) (abs1 ---> rep2) (T1 ===> T2)" |
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using assms unfolding Quotient_alt_def2 |
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unfolding fun_rel_def fun_eq_iff map_fun_apply |
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by (safe, metis+) |
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lemma apply_rsp: |
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fixes f g::"'a \<Rightarrow> 'c" |
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assumes q: "Quotient R1 Abs1 Rep1 T1" |
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and a: "(R1 ===> R2) f g" "R1 x y" |
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shows "R2 (f x) (g y)" |
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using a by (auto elim: fun_relE) |
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lemma apply_rsp': |
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assumes a: "(R1 ===> R2) f g" "R1 x y" |
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shows "R2 (f x) (g y)" |
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using a by (auto elim: fun_relE) |
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lemma apply_rsp'': |
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assumes "Quotient R Abs Rep T" |
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and "(R ===> S) f f" |
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shows "S (f (Rep x)) (f (Rep x))" |
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proof - |
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from assms(1) have "R (Rep x) (Rep x)" by (rule Quotient_rep_reflp) |
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then show ?thesis using assms(2) by (auto intro: apply_rsp') |
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qed |
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subsection {* Quotient composition *} |
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lemma Quotient_compose: |
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assumes 1: "Quotient R1 Abs1 Rep1 T1" |
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assumes 2: "Quotient R2 Abs2 Rep2 T2" |
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shows "Quotient (T1 OO R2 OO conversep T1) (Abs2 \<circ> Abs1) (Rep1 \<circ> Rep2) (T1 OO T2)" |
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using assms unfolding Quotient_alt_def4 by (auto intro!: ext) |
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lemma equivp_reflp2: |
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"equivp R \<Longrightarrow> reflp R" |
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by (erule equivpE) |
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subsection {* Respects predicate *} |
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definition Respects :: "('a \<Rightarrow> 'a \<Rightarrow> bool) \<Rightarrow> 'a set" |
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where "Respects R = {x. R x x}" |
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lemma in_respects: "x \<in> Respects R \<longleftrightarrow> R x x" |
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unfolding Respects_def by simp |
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subsection {* Invariant *} |
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definition invariant :: "('a \<Rightarrow> bool) \<Rightarrow> 'a \<Rightarrow> 'a \<Rightarrow> bool" |
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where "invariant R = (\<lambda>x y. R x \<and> x = y)" |
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lemma invariant_to_eq: |
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assumes "invariant P x y" |
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shows "x = y" |
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using assms by (simp add: invariant_def) |
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lemma fun_rel_eq_invariant: |
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shows "((invariant R) ===> S) = (\<lambda>f g. \<forall>x. R x \<longrightarrow> S (f x) (g x))" |
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by (auto simp add: invariant_def fun_rel_def) |
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lemma invariant_same_args: |
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shows "invariant P x x \<equiv> P x" |
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using assms by (auto simp add: invariant_def) |
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lemma UNIV_typedef_to_Quotient: |
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assumes "type_definition Rep Abs UNIV" |
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and T_def: "T \<equiv> (\<lambda>x y. x = Rep y)" |
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shows "Quotient (op =) Abs Rep T" |
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proof - |
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interpret type_definition Rep Abs UNIV by fact |
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from Abs_inject Rep_inverse Abs_inverse T_def show ?thesis |
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by (fastforce intro!: QuotientI fun_eq_iff) |
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qed |
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lemma UNIV_typedef_to_equivp: |
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fixes Abs :: "'a \<Rightarrow> 'b" |
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and Rep :: "'b \<Rightarrow> 'a" |
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assumes "type_definition Rep Abs (UNIV::'a set)" |
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shows "equivp (op=::'a\<Rightarrow>'a\<Rightarrow>bool)" |
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by (rule identity_equivp) |
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lemma typedef_to_Quotient: |
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assumes "type_definition Rep Abs S" |
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and T_def: "T \<equiv> (\<lambda>x y. x = Rep y)" |
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shows "Quotient (invariant (\<lambda>x. x \<in> S)) Abs Rep T" |
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proof - |
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interpret type_definition Rep Abs S by fact |
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from Rep Abs_inject Rep_inverse Abs_inverse T_def show ?thesis |
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by (auto intro!: QuotientI simp: invariant_def fun_eq_iff) |
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qed |
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lemma typedef_to_part_equivp: |
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assumes "type_definition Rep Abs S" |
47501 | 238 |
shows "part_equivp (invariant (\<lambda>x. x \<in> S))" |
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proof (intro part_equivpI) |
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interpret type_definition Rep Abs S by fact |
47501 | 241 |
show "\<exists>x. invariant (\<lambda>x. x \<in> S) x x" using Rep by (auto simp: invariant_def) |
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next |
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show "symp (invariant (\<lambda>x. x \<in> S))" by (auto intro: sympI simp: invariant_def) |
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next |
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show "transp (invariant (\<lambda>x. x \<in> S))" by (auto intro: transpI simp: invariant_def) |
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qed |
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lemma open_typedef_to_Quotient: |
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assumes "type_definition Rep Abs {x. P x}" |
47354 | 250 |
and T_def: "T \<equiv> (\<lambda>x y. x = Rep y)" |
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shows "Quotient (invariant P) Abs Rep T" |
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using typedef_to_Quotient [OF assms] by simp |
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lemma open_typedef_to_part_equivp: |
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assumes "type_definition Rep Abs {x. P x}" |
256 |
shows "part_equivp (invariant P)" |
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using typedef_to_part_equivp [OF assms] by simp |
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47376 | 259 |
text {* Generating transfer rules for quotients. *} |
260 |
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context |
262 |
fixes R Abs Rep T |
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assumes 1: "Quotient R Abs Rep T" |
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begin |
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47376 | 265 |
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lemma Quotient_right_unique: "right_unique T" |
267 |
using 1 unfolding Quotient_alt_def right_unique_def by metis |
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268 |
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lemma Quotient_right_total: "right_total T" |
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using 1 unfolding Quotient_alt_def right_total_def by metis |
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271 |
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lemma Quotient_rel_eq_transfer: "(T ===> T ===> op =) R (op =)" |
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using 1 unfolding Quotient_alt_def fun_rel_def by simp |
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lemma Quotient_abs_induct: |
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assumes "\<And>y. R y y \<Longrightarrow> P (Abs y)" shows "P x" |
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277 |
using 1 assms unfolding Quotient_def by metis |
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278 |
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lemma Quotient_All_transfer: |
280 |
"((T ===> op =) ===> op =) (Ball (Respects R)) All" |
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unfolding fun_rel_def Respects_def Quotient_cr_rel [OF 1] |
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by (auto, metis Quotient_abs_induct) |
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lemma Quotient_Ex_transfer: |
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"((T ===> op =) ===> op =) (Bex (Respects R)) Ex" |
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unfolding fun_rel_def Respects_def Quotient_cr_rel [OF 1] |
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by (auto, metis Quotient_rep_reflp [OF 1] Quotient_abs_rep [OF 1]) |
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lemma Quotient_forall_transfer: |
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"((T ===> op =) ===> op =) (transfer_bforall (\<lambda>x. R x x)) transfer_forall" |
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291 |
using Quotient_All_transfer |
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unfolding transfer_forall_def transfer_bforall_def |
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Ball_def [abs_def] in_respects . |
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47537 | 295 |
end |
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text {* Generating transfer rules for total quotients. *} |
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context |
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fixes R Abs Rep T |
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assumes 1: "Quotient R Abs Rep T" and 2: "reflp R" |
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begin |
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lemma Quotient_bi_total: "bi_total T" |
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using 1 2 unfolding Quotient_alt_def bi_total_def reflp_def by auto |
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lemma Quotient_id_abs_transfer: "(op = ===> T) (\<lambda>x. x) Abs" |
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using 1 2 unfolding Quotient_alt_def reflp_def fun_rel_def by simp |
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lemma Quotient_total_abs_induct: "(\<And>y. P (Abs y)) \<Longrightarrow> P x" |
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using 1 2 assms unfolding Quotient_alt_def reflp_def by metis |
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lemma Quotient_total_abs_eq_iff: "Abs x = Abs y \<longleftrightarrow> R x y" |
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using Quotient_rel [OF 1] 2 unfolding reflp_def by simp |
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end |
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text {* Generating transfer rules for a type defined with @{text "typedef"}. *} |
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context |
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fixes Rep Abs A T |
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assumes type: "type_definition Rep Abs A" |
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assumes T_def: "T \<equiv> (\<lambda>(x::'a) (y::'b). x = Rep y)" |
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begin |
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lemma typedef_bi_unique: "bi_unique T" |
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unfolding bi_unique_def T_def |
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by (simp add: type_definition.Rep_inject [OF type]) |
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lemma typedef_rep_transfer: "(T ===> op =) (\<lambda>x. x) Rep" |
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unfolding fun_rel_def T_def by simp |
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lemma typedef_All_transfer: "((T ===> op =) ===> op =) (Ball A) All" |
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unfolding T_def fun_rel_def |
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by (metis type_definition.Rep [OF type] |
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type_definition.Abs_inverse [OF type]) |
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lemma typedef_Ex_transfer: "((T ===> op =) ===> op =) (Bex A) Ex" |
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unfolding T_def fun_rel_def |
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by (metis type_definition.Rep [OF type] |
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type_definition.Abs_inverse [OF type]) |
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lemma typedef_forall_transfer: |
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"((T ===> op =) ===> op =) |
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(transfer_bforall (\<lambda>x. x \<in> A)) transfer_forall" |
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unfolding transfer_bforall_def transfer_forall_def Ball_def [symmetric] |
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by (rule typedef_All_transfer) |
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end |
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text {* Generating the correspondence rule for a constant defined with |
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@{text "lift_definition"}. *} |
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lemma Quotient_to_transfer: |
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assumes "Quotient R Abs Rep T" and "R c c" and "c' \<equiv> Abs c" |
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shows "T c c'" |
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using assms by (auto dest: Quotient_cr_rel) |
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subsection {* ML setup *} |
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use "Tools/Lifting/lifting_util.ML" |
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use "Tools/Lifting/lifting_info.ML" |
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setup Lifting_Info.setup |
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declare fun_quotient[quot_map] |
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use "Tools/Lifting/lifting_term.ML" |
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use "Tools/Lifting/lifting_def.ML" |
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use "Tools/Lifting/lifting_setup.ML" |
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hide_const (open) invariant |
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end |