author | wenzelm |
Sat, 09 Nov 2013 18:00:36 +0100 | |
changeset 54381 | 9c1f21365326 |
parent 53026 | e1a548c11845 |
child 55466 | 786edc984c98 |
permissions | -rw-r--r-- |
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(* Title: HOL/Library/Quotient_Option.thy |
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Author: Cezary Kaliszyk and Christian Urban |
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*) |
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header {* Quotient infrastructure for the option type *} |
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theory Quotient_Option |
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imports Main Quotient_Syntax |
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begin |
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subsection {* Rules for the Quotient package *} |
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lemma option_rel_map1: |
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"option_rel R (Option.map f x) y \<longleftrightarrow> option_rel (\<lambda>x. R (f x)) x y" |
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by (simp add: option_rel_def split: option.split) |
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lemma option_rel_map2: |
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"option_rel R x (Option.map f y) \<longleftrightarrow> option_rel (\<lambda>x y. R x (f y)) x y" |
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by (simp add: option_rel_def split: option.split) |
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lemma option_map_id [id_simps]: |
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"Option.map id = id" |
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by (simp add: id_def Option.map.identity fun_eq_iff) |
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lemma option_rel_eq [id_simps]: |
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"option_rel (op =) = (op =)" |
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by (simp add: option_rel_def fun_eq_iff split: option.split) |
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lemma option_symp: |
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"symp R \<Longrightarrow> symp (option_rel R)" |
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unfolding symp_def split_option_all option_rel_simps by fast |
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lemma option_transp: |
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"transp R \<Longrightarrow> transp (option_rel R)" |
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unfolding transp_def split_option_all option_rel_simps by fast |
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lemma option_equivp [quot_equiv]: |
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"equivp R \<Longrightarrow> equivp (option_rel R)" |
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by (blast intro: equivpI reflp_option_rel option_symp option_transp elim: equivpE) |
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lemma option_quotient [quot_thm]: |
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assumes "Quotient3 R Abs Rep" |
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shows "Quotient3 (option_rel R) (Option.map Abs) (Option.map Rep)" |
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apply (rule Quotient3I) |
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apply (simp_all add: Option.map.compositionality comp_def Option.map.identity option_rel_eq option_rel_map1 option_rel_map2 Quotient3_abs_rep [OF assms] Quotient3_rel_rep [OF assms]) |
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using Quotient3_rel [OF assms] |
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apply (simp add: option_rel_def split: option.split) |
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done |
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declare [[mapQ3 option = (option_rel, option_quotient)]] |
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lemma option_None_rsp [quot_respect]: |
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assumes q: "Quotient3 R Abs Rep" |
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shows "option_rel R None None" |
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by (rule None_transfer) |
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lemma option_Some_rsp [quot_respect]: |
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assumes q: "Quotient3 R Abs Rep" |
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shows "(R ===> option_rel R) Some Some" |
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by (rule Some_transfer) |
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lemma option_None_prs [quot_preserve]: |
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assumes q: "Quotient3 R Abs Rep" |
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shows "Option.map Abs None = None" |
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by simp |
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lemma option_Some_prs [quot_preserve]: |
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assumes q: "Quotient3 R Abs Rep" |
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shows "(Rep ---> Option.map Abs) Some = Some" |
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apply(simp add: fun_eq_iff) |
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apply(simp add: Quotient3_abs_rep[OF q]) |
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done |
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end |