src/HOLCF/Pcpo.thy
author huffman
Tue, 08 Mar 2005 00:00:49 +0100
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(*  Title:      HOLCF/Pcpo.thy
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    ID:         $Id$
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    Author:     Franz Regensburger
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    License:    GPL (GNU GENERAL PUBLIC LICENSE)
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introduction of the classes cpo and pcpo 
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*)
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header {* Classes cpo and pcpo *}
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theory Pcpo
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imports Porder
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begin
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c22b85994e17 Franz Regensburger's Higher-Order Logic of Computable Functions embedding LCF
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subsection {* Complete partial orders *}
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text {* The class cpo of chain complete partial orders *}
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axclass cpo < po
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        -- {* class axiom: *}
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  cpo:   "chain S ==> ? x. range S <<| x" 
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text {* in cpo's everthing equal to THE lub has lub properties for every chain *}
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lemma thelubE: "[| chain(S); lub(range(S)) = (l::'a::cpo) |] ==> range(S) <<| l"
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by (blast dest: cpo intro: lubI)
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text {* Properties of the lub *}
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lemma is_ub_thelub: "chain (S::nat => 'a::cpo) ==> S(x) << lub(range(S))"
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by (blast dest: cpo intro: lubI [THEN is_ub_lub])
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lemma is_lub_thelub: "[| chain (S::nat => 'a::cpo); range(S) <| x |] ==> lub(range S) << x"
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by (blast dest: cpo intro: lubI [THEN is_lub_lub])
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lemma lub_range_mono: "[| range X <= range Y;  chain Y; chain (X::nat=>'a::cpo) |] ==> lub(range X) << lub(range Y)"
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apply (erule is_lub_thelub)
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apply (rule ub_rangeI)
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apply (subgoal_tac "? j. X i = Y j")
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apply  clarsimp
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apply  (erule is_ub_thelub)
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apply auto
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done
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lemma lub_range_shift: "chain (Y::nat=>'a::cpo) ==> lub(range (%i. Y(i + j))) = lub(range Y)"
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apply (rule antisym_less)
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apply (rule lub_range_mono)
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apply    fast
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apply   assumption
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apply (erule chain_shift)
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apply (rule is_lub_thelub)
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apply assumption
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apply (rule ub_rangeI)
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apply (rule trans_less)
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apply (rule_tac [2] is_ub_thelub)
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apply (erule_tac [2] chain_shift)
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apply (erule chain_mono3)
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apply (rule le_add1)
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done
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lemma maxinch_is_thelub: "chain Y ==> max_in_chain i Y = (lub(range(Y)) = ((Y i)::'a::cpo))"
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apply (rule iffI)
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apply (fast intro!: thelubI lub_finch1)
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apply (unfold max_in_chain_def)
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apply (safe intro!: antisym_less)
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apply (fast elim!: chain_mono3)
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apply (drule sym)
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apply (force elim!: is_ub_thelub)
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done
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text {* the @{text "<<"} relation between two chains is preserved by their lubs *}
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lemma lub_mono: "[|chain(C1::(nat=>'a::cpo));chain(C2); ALL k. C1(k) << C2(k)|] 
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      ==> lub(range(C1)) << lub(range(C2))"
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apply (erule is_lub_thelub)
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apply (rule ub_rangeI)
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apply (rule trans_less)
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apply (erule spec)
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apply (erule is_ub_thelub)
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done
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text {* the = relation between two chains is preserved by their lubs *}
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lemma lub_equal: "[| chain(C1::(nat=>'a::cpo));chain(C2);ALL k. C1(k)=C2(k)|] 
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      ==> lub(range(C1))=lub(range(C2))"
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by (simp only: expand_fun_eq [symmetric])
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text {* more results about mono and = of lubs of chains *}
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lemma lub_mono2: "[|EX j. ALL i. j<i --> X(i::nat)=Y(i);chain(X::nat=>'a::cpo);chain(Y)|] 
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      ==> lub(range(X))<<lub(range(Y))"
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apply (erule exE)
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apply (rule is_lub_thelub)
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apply assumption
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apply (rule ub_rangeI)
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apply (case_tac "j<i")
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apply (rule_tac s = "Y (i) " and t = "X (i) " in subst)
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apply (rule sym)
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apply fast
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apply (rule is_ub_thelub)
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apply assumption
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apply (rule_tac y = "X (Suc (j))" in trans_less)
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apply (rule chain_mono)
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apply assumption
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apply (rule not_less_eq [THEN subst])
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apply assumption
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apply (rule_tac s = "Y (Suc (j))" and t = "X (Suc (j))" in subst)
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apply (simp)
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apply (erule is_ub_thelub)
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done
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lemma lub_equal2: "[|EX j. ALL i. j<i --> X(i)=Y(i); chain(X::nat=>'a::cpo); chain(Y)|] 
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      ==> lub(range(X))=lub(range(Y))"
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by (blast intro: antisym_less lub_mono2 sym)
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lemma lub_mono3: "[|chain(Y::nat=>'a::cpo);chain(X); 
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 ALL i. EX j. Y(i)<< X(j)|]==> lub(range(Y))<<lub(range(X))"
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apply (rule is_lub_thelub)
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apply assumption
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apply (rule ub_rangeI)
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apply (erule allE)
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apply (erule exE)
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apply (rule trans_less)
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apply (rule_tac [2] is_ub_thelub)
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prefer 2 apply (assumption)
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apply assumption
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done
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subsection {* Pointed cpos *}
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text {* The class pcpo of pointed cpos *}
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axclass pcpo < cpo
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  least:         "? x.!y. x<<y"
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consts
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  UU            :: "'a::pcpo"
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syntax (xsymbols)
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  UU            :: "'a::pcpo"                           ("\<bottom>")
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defs
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  UU_def:        "UU == @x.!y. x<<y"
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text {* derive the old rule minimal *}
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lemma UU_least: "ALL z. UU << z"
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apply (unfold UU_def)
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apply (rule some_eq_ex [THEN iffD2])
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apply (rule least)
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done
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lemmas minimal = UU_least [THEN spec, standard]
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declare minimal [iff]
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text {* useful lemmas about @{term UU} *}
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lemma eq_UU_iff: "(x=UU)=(x<<UU)"
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apply (rule iffI)
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apply (erule ssubst)
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apply (rule refl_less)
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apply (rule antisym_less)
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apply assumption
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apply (rule minimal)
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done
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lemma UU_I: "x << UU ==> x = UU"
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by (subst eq_UU_iff)
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lemma not_less2not_eq: "~(x::'a::po)<<y ==> ~x=y"
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by auto
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lemma chain_UU_I: "[|chain(Y);lub(range(Y))=UU|] ==> ALL i. Y(i)=UU"
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apply (rule allI)
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apply (rule antisym_less)
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apply (rule_tac [2] minimal)
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apply (erule subst)
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apply (erule is_ub_thelub)
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done
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lemma chain_UU_I_inverse: "ALL i. Y(i::nat)=UU ==> lub(range(Y::(nat=>'a::pcpo)))=UU"
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apply (rule lub_chain_maxelem)
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apply (erule spec)
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apply simp
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done
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lemma chain_UU_I_inverse2: "~lub(range(Y::(nat=>'a::pcpo)))=UU ==> EX i.~ Y(i)=UU"
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by (blast intro: chain_UU_I_inverse)
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lemma notUU_I: "[| x<<y; ~x=UU |] ==> ~y=UU"
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by (blast intro: UU_I)
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lemma chain_mono2: 
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 "[|EX j. ~Y(j)=UU;chain(Y::nat=>'a::pcpo)|] ==> EX j. ALL i. j<i-->~Y(i)=UU"
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by (blast dest: notUU_I chain_mono)
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subsection {* Chain-finite and flat cpos *}
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text {* further useful classes for HOLCF domains *}
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axclass chfin < cpo
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  chfin: 	"!Y. chain Y-->(? n. max_in_chain n Y)"
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axclass flat < pcpo
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  ax_flat:	 	"! x y. x << y --> (x = UU) | (x=y)"
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text {* some properties for chfin and flat *}
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text {* flat types are chfin *}
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lemma flat_imp_chfin: 
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  -- {*Used only in an "instance" declaration (Fun1.thy)*}
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     "ALL Y::nat=>'a::flat. chain Y --> (EX n. max_in_chain n Y)"
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apply (unfold max_in_chain_def)
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apply clarify
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apply (case_tac "ALL i. Y (i) =UU")
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apply (rule_tac x = "0" in exI)
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apply simp
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apply simp
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apply (erule exE)
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apply (rule_tac x = "i" in exI)
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apply clarify
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apply (erule le_imp_less_or_eq [THEN disjE])
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apply safe
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apply (blast dest: chain_mono ax_flat [rule_format])
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done
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instance flat < chfin
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by intro_classes (rule flat_imp_chfin)
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text {* flat subclass of chfin @{text "-->"} @{text adm_flat} not needed *}
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lemma flat_eq: "(a::'a::flat) ~= UU ==> a << b = (a = b)"
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by (safe dest!: ax_flat [rule_format])
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lemma chfin2finch: "chain (Y::nat=>'a::chfin) ==> finite_chain Y"
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by (simp add: chfin finite_chain_def)
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text {* lemmata for improved admissibility introdution rule *}
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lemma infinite_chain_adm_lemma:
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"[|chain Y; ALL i. P (Y i);  
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   (!!Y. [| chain Y; ALL i. P (Y i); ~ finite_chain Y |] ==> P (lub(range Y))) 
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  |] ==> P (lub (range Y))"
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apply (case_tac "finite_chain Y")
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prefer 2 apply fast
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apply (unfold finite_chain_def)
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apply safe
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apply (erule lub_finch1 [THEN thelubI, THEN ssubst])
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apply assumption
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apply (erule spec)
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done
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lemma increasing_chain_adm_lemma:
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"[|chain Y;  ALL i. P (Y i);  
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   (!!Y. [| chain Y; ALL i. P (Y i);   
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            ALL i. EX j. i < j & Y i ~= Y j & Y i << Y j|] 
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  ==> P (lub (range Y))) |] ==> P (lub (range Y))"
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apply (erule infinite_chain_adm_lemma)
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apply assumption
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apply (erule thin_rl)
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apply (unfold finite_chain_def)
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apply (unfold max_in_chain_def)
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apply (fast dest: le_imp_less_or_eq elim: chain_mono)
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done
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243
c22b85994e17 Franz Regensburger's Higher-Order Logic of Computable Functions embedding LCF
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end