src/HOLCF/Domain.thy
author paulson
Fri, 05 Oct 2007 09:59:03 +0200
changeset 24854 0ebcd575d3c6
parent 23376 53317a1ec8b2
child 25806 2b976fcee6e5
permissions -rw-r--r--
filtering out some package theorems
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(*  Title:      HOLCF/Domain.thy
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    ID:         $Id$
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    Author:     Brian Huffman
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*)
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header {* Domain package *}
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theory Domain
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imports Ssum Sprod Up One Tr Fixrec
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begin
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defaultsort pcpo
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subsection {* Continuous isomorphisms *}
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text {* A locale for continuous isomorphisms *}
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locale iso =
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  fixes abs :: "'a \<rightarrow> 'b"
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  fixes rep :: "'b \<rightarrow> 'a"
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  assumes abs_iso [simp]: "rep\<cdot>(abs\<cdot>x) = x"
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  assumes rep_iso [simp]: "abs\<cdot>(rep\<cdot>y) = y"
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begin
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lemma swap: "iso rep abs"
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  by (rule iso.intro [OF rep_iso abs_iso])
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lemma abs_less: "(abs\<cdot>x \<sqsubseteq> abs\<cdot>y) = (x \<sqsubseteq> y)"
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proof
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  assume "abs\<cdot>x \<sqsubseteq> abs\<cdot>y"
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  then have "rep\<cdot>(abs\<cdot>x) \<sqsubseteq> rep\<cdot>(abs\<cdot>y)" by (rule monofun_cfun_arg)
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  then show "x \<sqsubseteq> y" by simp
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next
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  assume "x \<sqsubseteq> y"
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  then show "abs\<cdot>x \<sqsubseteq> abs\<cdot>y" by (rule monofun_cfun_arg)
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qed
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lemma rep_less: "(rep\<cdot>x \<sqsubseteq> rep\<cdot>y) = (x \<sqsubseteq> y)"
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  by (rule iso.abs_less [OF swap])
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lemma abs_eq: "(abs\<cdot>x = abs\<cdot>y) = (x = y)"
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  by (simp add: po_eq_conv abs_less)
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lemma rep_eq: "(rep\<cdot>x = rep\<cdot>y) = (x = y)"
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  by (rule iso.abs_eq [OF swap])
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lemma abs_strict: "abs\<cdot>\<bottom> = \<bottom>"
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proof -
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  have "\<bottom> \<sqsubseteq> rep\<cdot>\<bottom>" ..
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  then have "abs\<cdot>\<bottom> \<sqsubseteq> abs\<cdot>(rep\<cdot>\<bottom>)" by (rule monofun_cfun_arg)
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  then have "abs\<cdot>\<bottom> \<sqsubseteq> \<bottom>" by simp
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  then show ?thesis by (rule UU_I)
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qed
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lemma rep_strict: "rep\<cdot>\<bottom> = \<bottom>"
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  by (rule iso.abs_strict [OF swap])
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lemma abs_defin': "abs\<cdot>x = \<bottom> \<Longrightarrow> x = \<bottom>"
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proof -
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  have "x = rep\<cdot>(abs\<cdot>x)" by simp
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  also assume "abs\<cdot>x = \<bottom>"
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  also note rep_strict
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  finally show "x = \<bottom>" .
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qed
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lemma rep_defin': "rep\<cdot>z = \<bottom> \<Longrightarrow> z = \<bottom>"
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  by (rule iso.abs_defin' [OF swap])
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lemma abs_defined: "z \<noteq> \<bottom> \<Longrightarrow> abs\<cdot>z \<noteq> \<bottom>"
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  by (erule contrapos_nn, erule abs_defin')
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lemma rep_defined: "z \<noteq> \<bottom> \<Longrightarrow> rep\<cdot>z \<noteq> \<bottom>"
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  by (rule iso.abs_defined [OF iso.swap]) (rule iso_axioms)
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lemma abs_defined_iff: "(abs\<cdot>x = \<bottom>) = (x = \<bottom>)"
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  by (auto elim: abs_defin' intro: abs_strict)
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lemma rep_defined_iff: "(rep\<cdot>x = \<bottom>) = (x = \<bottom>)"
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  by (rule iso.abs_defined_iff [OF iso.swap]) (rule iso_axioms)
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lemma (in iso) compact_abs_rev: "compact (abs\<cdot>x) \<Longrightarrow> compact x"
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proof (unfold compact_def)
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  assume "adm (\<lambda>y. \<not> abs\<cdot>x \<sqsubseteq> y)"
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  with cont_Rep_CFun2
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  have "adm (\<lambda>y. \<not> abs\<cdot>x \<sqsubseteq> abs\<cdot>y)" by (rule adm_subst)
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  then show "adm (\<lambda>y. \<not> x \<sqsubseteq> y)" using abs_less by simp
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qed
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lemma compact_rep_rev: "compact (rep\<cdot>x) \<Longrightarrow> compact x"
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  by (rule iso.compact_abs_rev [OF iso.swap]) (rule iso_axioms)
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lemma compact_abs: "compact x \<Longrightarrow> compact (abs\<cdot>x)"
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  by (rule compact_rep_rev) simp
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lemma compact_rep: "compact x \<Longrightarrow> compact (rep\<cdot>x)"
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  by (rule iso.compact_abs [OF iso.swap]) (rule iso_axioms)
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lemma iso_swap: "(x = abs\<cdot>y) = (rep\<cdot>x = y)"
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proof
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  assume "x = abs\<cdot>y"
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  then have "rep\<cdot>x = rep\<cdot>(abs\<cdot>y)" by simp
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  then show "rep\<cdot>x = y" by simp
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next
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  assume "rep\<cdot>x = y"
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  then have "abs\<cdot>(rep\<cdot>x) = abs\<cdot>y" by simp
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  then show "x = abs\<cdot>y" by simp
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qed
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end
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subsection {* Casedist *}
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lemma ex_one_defined_iff:
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  "(\<exists>x. P x \<and> x \<noteq> \<bottom>) = P ONE"
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 apply safe
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  apply (rule_tac p=x in oneE)
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   apply simp
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  apply simp
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 apply force
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 done
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lemma ex_up_defined_iff:
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  "(\<exists>x. P x \<and> x \<noteq> \<bottom>) = (\<exists>x. P (up\<cdot>x))"
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 apply safe
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  apply (rule_tac p=x in upE)
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   apply simp
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  apply fast
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 apply (force intro!: up_defined)
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 done
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lemma ex_sprod_defined_iff:
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 "(\<exists>y. P y \<and> y \<noteq> \<bottom>) =
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  (\<exists>x y. (P (:x, y:) \<and> x \<noteq> \<bottom>) \<and> y \<noteq> \<bottom>)"
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 apply safe
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  apply (rule_tac p=y in sprodE)
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   apply simp
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  apply fast
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 apply (force intro!: spair_defined)
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 done
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lemma ex_sprod_up_defined_iff:
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 "(\<exists>y. P y \<and> y \<noteq> \<bottom>) =
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  (\<exists>x y. P (:up\<cdot>x, y:) \<and> y \<noteq> \<bottom>)"
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 apply safe
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  apply (rule_tac p=y in sprodE)
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   apply simp
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  apply (rule_tac p=x in upE)
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   apply simp
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  apply fast
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 apply (force intro!: spair_defined)
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 done
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lemma ex_ssum_defined_iff:
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 "(\<exists>x. P x \<and> x \<noteq> \<bottom>) =
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 ((\<exists>x. P (sinl\<cdot>x) \<and> x \<noteq> \<bottom>) \<or>
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  (\<exists>x. P (sinr\<cdot>x) \<and> x \<noteq> \<bottom>))"
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 apply (rule iffI)
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  apply (erule exE)
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  apply (erule conjE)
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  apply (rule_tac p=x in ssumE)
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    apply simp
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   apply (rule disjI1, fast)
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  apply (rule disjI2, fast)
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 apply (erule disjE)
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  apply force
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 apply force
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 done
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lemma exh_start: "p = \<bottom> \<or> (\<exists>x. p = x \<and> x \<noteq> \<bottom>)"
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  by auto
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lemmas ex_defined_iffs =
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   ex_ssum_defined_iff
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   ex_sprod_up_defined_iff
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   ex_sprod_defined_iff
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   ex_up_defined_iff
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   ex_one_defined_iff
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text {* Rules for turning exh into casedist *}
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lemma exh_casedist0: "\<lbrakk>R; R \<Longrightarrow> P\<rbrakk> \<Longrightarrow> P" (* like make_elim *)
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  by auto
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lemma exh_casedist1: "((P \<or> Q \<Longrightarrow> R) \<Longrightarrow> S) \<equiv> (\<lbrakk>P \<Longrightarrow> R; Q \<Longrightarrow> R\<rbrakk> \<Longrightarrow> S)"
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  by rule auto
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lemma exh_casedist2: "(\<exists>x. P x \<Longrightarrow> Q) \<equiv> (\<And>x. P x \<Longrightarrow> Q)"
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  by rule auto
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lemma exh_casedist3: "(P \<and> Q \<Longrightarrow> R) \<equiv> (P \<Longrightarrow> Q \<Longrightarrow> R)"
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  by rule auto
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lemmas exh_casedists = exh_casedist1 exh_casedist2 exh_casedist3
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subsection {* Setting up the package *}
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ML {*
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val iso_intro       = thm "iso.intro";
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val iso_abs_iso     = thm "iso.abs_iso";
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val iso_rep_iso     = thm "iso.rep_iso";
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val iso_abs_strict  = thm "iso.abs_strict";
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val iso_rep_strict  = thm "iso.rep_strict";
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val iso_abs_defin'  = thm "iso.abs_defin'";
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val iso_rep_defin'  = thm "iso.rep_defin'";
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val iso_abs_defined = thm "iso.abs_defined";
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val iso_rep_defined = thm "iso.rep_defined";
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val iso_compact_abs = thm "iso.compact_abs";
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val iso_compact_rep = thm "iso.compact_rep";
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val iso_iso_swap    = thm "iso.iso_swap";
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val exh_start = thm "exh_start";
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val ex_defined_iffs = thms "ex_defined_iffs";
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val exh_casedist0 = thm "exh_casedist0";
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val exh_casedists = thms "exh_casedists";
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*}
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end