author | huffman |
Thu, 31 Jan 2008 21:48:14 +0100 | |
changeset 26027 | 87cb69d27558 |
parent 26025 | ca6876116bb4 |
child 26029 | 46e84ca065f1 |
permissions | -rw-r--r-- |
15600 | 1 |
(* Title: HOLCF/Cprod.thy |
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ID: $Id$ |
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Author: Franz Regensburger |
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Partial ordering for cartesian product of HOL products. |
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*) |
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header {* The cpo of cartesian products *} |
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theory Cprod |
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imports Bifinite |
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begin |
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defaultsort cpo |
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subsection {* Type @{typ unit} is a pcpo *} |
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||
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instantiation unit :: sq_ord |
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begin |
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definition |
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less_unit_def [simp]: "x \<sqsubseteq> (y::unit) \<equiv> True" |
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||
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instance .. |
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end |
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instance unit :: discrete_cpo |
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by intro_classes simp |
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instance unit :: finite_po .. |
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instance unit :: pcpo |
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by intro_classes simp |
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||
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definition |
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unit_when :: "'a \<rightarrow> unit \<rightarrow> 'a" where |
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"unit_when = (\<Lambda> a _. a)" |
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translations |
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"\<Lambda>(). t" == "CONST unit_when\<cdot>t" |
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lemma unit_when [simp]: "unit_when\<cdot>a\<cdot>u = a" |
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by (simp add: unit_when_def) |
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||
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subsection {* Product type is a partial order *} |
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instantiation "*" :: (po, po) po |
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begin |
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definition |
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less_cprod_def: "(op \<sqsubseteq>) \<equiv> \<lambda>p1 p2. (fst p1 \<sqsubseteq> fst p2 \<and> snd p1 \<sqsubseteq> snd p2)" |
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instance |
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proof |
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fix x :: "'a \<times> 'b" |
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show "x \<sqsubseteq> x" |
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unfolding less_cprod_def by simp |
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next |
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fix x y :: "'a \<times> 'b" |
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assume "x \<sqsubseteq> y" "y \<sqsubseteq> x" thus "x = y" |
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unfolding less_cprod_def Pair_fst_snd_eq |
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by (fast intro: antisym_less) |
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next |
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fix x y z :: "'a \<times> 'b" |
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assume "x \<sqsubseteq> y" "y \<sqsubseteq> z" thus "x \<sqsubseteq> z" |
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unfolding less_cprod_def |
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by (fast intro: trans_less) |
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qed |
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end |
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subsection {* Monotonicity of @{text "(_,_)"}, @{term fst}, @{term snd} *} |
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text {* Pair @{text "(_,_)"} is monotone in both arguments *} |
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lemma monofun_pair1: "monofun (\<lambda>x. (x, y))" |
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by (simp add: monofun_def less_cprod_def) |
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|
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lemma monofun_pair2: "monofun (\<lambda>y. (x, y))" |
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by (simp add: monofun_def less_cprod_def) |
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lemma monofun_pair: |
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"\<lbrakk>x1 \<sqsubseteq> x2; y1 \<sqsubseteq> y2\<rbrakk> \<Longrightarrow> (x1, y1) \<sqsubseteq> (x2, y2)" |
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by (simp add: less_cprod_def) |
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text {* @{term fst} and @{term snd} are monotone *} |
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lemma monofun_fst: "monofun fst" |
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by (simp add: monofun_def less_cprod_def) |
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lemma monofun_snd: "monofun snd" |
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by (simp add: monofun_def less_cprod_def) |
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subsection {* Product type is a cpo *} |
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lemma is_lub_Pair: |
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"\<lbrakk>range X <<| x; range Y <<| y\<rbrakk> \<Longrightarrow> range (\<lambda>i. (X i, Y i)) <<| (x, y)" |
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apply (rule is_lubI [OF ub_rangeI]) |
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apply (simp add: less_cprod_def is_ub_lub) |
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apply (frule ub2ub_monofun [OF monofun_fst]) |
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apply (drule ub2ub_monofun [OF monofun_snd]) |
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apply (simp add: less_cprod_def is_lub_lub) |
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done |
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lemma lub_cprod: |
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fixes S :: "nat \<Rightarrow> ('a::cpo \<times> 'b::cpo)" |
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assumes S: "chain S" |
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shows "range S <<| (\<Squnion>i. fst (S i), \<Squnion>i. snd (S i))" |
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proof - |
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have "chain (\<lambda>i. fst (S i))" |
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using monofun_fst S by (rule ch2ch_monofun) |
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hence 1: "range (\<lambda>i. fst (S i)) <<| (\<Squnion>i. fst (S i))" |
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by (rule cpo_lubI) |
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have "chain (\<lambda>i. snd (S i))" |
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using monofun_snd S by (rule ch2ch_monofun) |
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hence 2: "range (\<lambda>i. snd (S i)) <<| (\<Squnion>i. snd (S i))" |
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by (rule cpo_lubI) |
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show "range S <<| (\<Squnion>i. fst (S i), \<Squnion>i. snd (S i))" |
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using is_lub_Pair [OF 1 2] by simp |
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qed |
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lemma thelub_cprod: |
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"chain (S::nat \<Rightarrow> 'a::cpo \<times> 'b::cpo) |
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\<Longrightarrow> lub (range S) = (\<Squnion>i. fst (S i), \<Squnion>i. snd (S i))" |
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by (rule lub_cprod [THEN thelubI]) |
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instance "*" :: (cpo, cpo) cpo |
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proof |
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fix S :: "nat \<Rightarrow> ('a \<times> 'b)" |
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assume "chain S" |
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hence "range S <<| (\<Squnion>i. fst (S i), \<Squnion>i. snd (S i))" |
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by (rule lub_cprod) |
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thus "\<exists>x. range S <<| x" .. |
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qed |
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instance "*" :: (finite_po, finite_po) finite_po .. |
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138 |
|
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instance "*" :: (discrete_cpo, discrete_cpo) discrete_cpo |
140 |
proof |
|
141 |
fix x y :: "'a \<times> 'b" |
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142 |
show "x \<sqsubseteq> y \<longleftrightarrow> x = y" |
|
143 |
unfolding less_cprod_def Pair_fst_snd_eq |
|
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by simp |
|
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qed |
|
146 |
||
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subsection {* Product type is pointed *} |
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lemma minimal_cprod: "(\<bottom>, \<bottom>) \<sqsubseteq> p" |
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by (simp add: less_cprod_def) |
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|
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instance "*" :: (pcpo, pcpo) pcpo |
153 |
by intro_classes (fast intro: minimal_cprod) |
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lemma inst_cprod_pcpo: "\<bottom> = (\<bottom>, \<bottom>)" |
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by (rule minimal_cprod [THEN UU_I, symmetric]) |
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subsection {* Continuity of @{text "(_,_)"}, @{term fst}, @{term snd} *} |
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lemma cont_pair1: "cont (\<lambda>x. (x, y))" |
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apply (rule contI) |
163 |
apply (rule is_lub_Pair) |
|
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apply (erule cpo_lubI) |
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apply (rule lub_const) |
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166 |
done |
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167 |
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lemma cont_pair2: "cont (\<lambda>y. (x, y))" |
26018 | 169 |
apply (rule contI) |
170 |
apply (rule is_lub_Pair) |
|
171 |
apply (rule lub_const) |
|
26027 | 172 |
apply (erule cpo_lubI) |
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173 |
done |
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174 |
|
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lemma contlub_fst: "contlub fst" |
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176 |
apply (rule contlubI) |
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apply (simp add: thelub_cprod) |
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178 |
done |
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179 |
|
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lemma contlub_snd: "contlub snd" |
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181 |
apply (rule contlubI) |
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182 |
apply (simp add: thelub_cprod) |
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183 |
done |
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184 |
|
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lemma cont_fst: "cont fst" |
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186 |
apply (rule monocontlub2cont) |
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apply (rule monofun_fst) |
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apply (rule contlub_fst) |
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189 |
done |
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190 |
|
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191 |
lemma cont_snd: "cont snd" |
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apply (rule monocontlub2cont) |
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apply (rule monofun_snd) |
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apply (rule contlub_snd) |
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195 |
done |
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196 |
|
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197 |
subsection {* Continuous versions of constants *} |
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198 |
|
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199 |
definition |
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cpair :: "'a \<rightarrow> 'b \<rightarrow> ('a * 'b)" -- {* continuous pairing *} where |
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"cpair = (\<Lambda> x y. (x, y))" |
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202 |
|
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203 |
definition |
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cfst :: "('a * 'b) \<rightarrow> 'a" where |
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"cfst = (\<Lambda> p. fst p)" |
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|
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207 |
definition |
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csnd :: "('a * 'b) \<rightarrow> 'b" where |
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"csnd = (\<Lambda> p. snd p)" |
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|
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211 |
definition |
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csplit :: "('a \<rightarrow> 'b \<rightarrow> 'c) \<rightarrow> ('a * 'b) \<rightarrow> 'c" where |
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"csplit = (\<Lambda> f p. f\<cdot>(cfst\<cdot>p)\<cdot>(csnd\<cdot>p))" |
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214 |
|
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syntax |
17834 | 216 |
"_ctuple" :: "['a, args] \<Rightarrow> 'a * 'b" ("(1<_,/ _>)") |
217 |
||
218 |
syntax (xsymbols) |
|
219 |
"_ctuple" :: "['a, args] \<Rightarrow> 'a * 'b" ("(1\<langle>_,/ _\<rangle>)") |
|
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220 |
|
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221 |
translations |
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"\<langle>x, y, z\<rangle>" == "\<langle>x, \<langle>y, z\<rangle>\<rangle>" |
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"\<langle>x, y\<rangle>" == "CONST cpair\<cdot>x\<cdot>y" |
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|
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225 |
translations |
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"\<Lambda>(CONST cpair\<cdot>x\<cdot>y). t" == "CONST csplit\<cdot>(\<Lambda> x y. t)" |
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227 |
|
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228 |
|
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229 |
subsection {* Convert all lemmas to the continuous versions *} |
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230 |
|
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lemma cpair_eq_pair: "<x, y> = (x, y)" |
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by (simp add: cpair_def cont_pair1 cont_pair2) |
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233 |
|
25910 | 234 |
lemma pair_eq_cpair: "(x, y) = <x, y>" |
235 |
by (simp add: cpair_def cont_pair1 cont_pair2) |
|
236 |
||
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lemma inject_cpair: "<a,b> = <aa,ba> \<Longrightarrow> a = aa \<and> b = ba" |
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238 |
by (simp add: cpair_eq_pair) |
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239 |
|
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lemma cpair_eq [iff]: "(<a, b> = <a', b'>) = (a = a' \<and> b = b')" |
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241 |
by (simp add: cpair_eq_pair) |
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242 |
|
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243 |
lemma cpair_less [iff]: "(<a, b> \<sqsubseteq> <a', b'>) = (a \<sqsubseteq> a' \<and> b \<sqsubseteq> b')" |
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by (simp add: cpair_eq_pair less_cprod_def) |
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|
245 |
|
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246 |
lemma cpair_defined_iff [iff]: "(<x, y> = \<bottom>) = (x = \<bottom> \<and> y = \<bottom>)" |
16916 | 247 |
by (simp add: inst_cprod_pcpo cpair_eq_pair) |
248 |
||
25913 | 249 |
lemma cpair_strict [simp]: "\<langle>\<bottom>, \<bottom>\<rangle> = \<bottom>" |
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250 |
by simp |
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|
251 |
|
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252 |
lemma inst_cprod_pcpo2: "\<bottom> = <\<bottom>, \<bottom>>" |
16916 | 253 |
by (rule cpair_strict [symmetric]) |
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254 |
|
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lemma defined_cpair_rev: |
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256 |
"<a,b> = \<bottom> \<Longrightarrow> a = \<bottom> \<and> b = \<bottom>" |
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257 |
by simp |
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258 |
|
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259 |
lemma Exh_Cprod2: "\<exists>a b. z = <a, b>" |
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260 |
by (simp add: cpair_eq_pair) |
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|
261 |
|
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262 |
lemma cprodE: "\<lbrakk>\<And>x y. p = <x, y> \<Longrightarrow> Q\<rbrakk> \<Longrightarrow> Q" |
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263 |
by (cut_tac Exh_Cprod2, auto) |
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|
264 |
|
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265 |
lemma cfst_cpair [simp]: "cfst\<cdot><x, y> = x" |
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266 |
by (simp add: cpair_eq_pair cfst_def cont_fst) |
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267 |
|
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268 |
lemma csnd_cpair [simp]: "csnd\<cdot><x, y> = y" |
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269 |
by (simp add: cpair_eq_pair csnd_def cont_snd) |
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270 |
|
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271 |
lemma cfst_strict [simp]: "cfst\<cdot>\<bottom> = \<bottom>" |
25913 | 272 |
unfolding inst_cprod_pcpo2 by (rule cfst_cpair) |
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273 |
|
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274 |
lemma csnd_strict [simp]: "csnd\<cdot>\<bottom> = \<bottom>" |
25913 | 275 |
unfolding inst_cprod_pcpo2 by (rule csnd_cpair) |
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276 |
|
25910 | 277 |
lemma cpair_cfst_csnd: "\<langle>cfst\<cdot>p, csnd\<cdot>p\<rangle> = p" |
278 |
by (cases p rule: cprodE, simp) |
|
279 |
||
280 |
lemmas surjective_pairing_Cprod2 = cpair_cfst_csnd |
|
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281 |
|
16750 | 282 |
lemma less_cprod: "x \<sqsubseteq> y = (cfst\<cdot>x \<sqsubseteq> cfst\<cdot>y \<and> csnd\<cdot>x \<sqsubseteq> csnd\<cdot>y)" |
16315 | 283 |
by (simp add: less_cprod_def cfst_def csnd_def cont_fst cont_snd) |
284 |
||
16750 | 285 |
lemma eq_cprod: "(x = y) = (cfst\<cdot>x = cfst\<cdot>y \<and> csnd\<cdot>x = csnd\<cdot>y)" |
286 |
by (auto simp add: po_eq_conv less_cprod) |
|
287 |
||
25879 | 288 |
lemma cfst_less_iff: "cfst\<cdot>x \<sqsubseteq> y = x \<sqsubseteq> <y, csnd\<cdot>x>" |
289 |
by (simp add: less_cprod) |
|
290 |
||
291 |
lemma csnd_less_iff: "csnd\<cdot>x \<sqsubseteq> y = x \<sqsubseteq> <cfst\<cdot>x, y>" |
|
292 |
by (simp add: less_cprod) |
|
293 |
||
294 |
lemma compact_cfst: "compact x \<Longrightarrow> compact (cfst\<cdot>x)" |
|
295 |
by (rule compactI, simp add: cfst_less_iff) |
|
296 |
||
297 |
lemma compact_csnd: "compact x \<Longrightarrow> compact (csnd\<cdot>x)" |
|
298 |
by (rule compactI, simp add: csnd_less_iff) |
|
299 |
||
300 |
lemma compact_cpair: "\<lbrakk>compact x; compact y\<rbrakk> \<Longrightarrow> compact <x, y>" |
|
17837 | 301 |
by (rule compactI, simp add: less_cprod) |
302 |
||
25879 | 303 |
lemma compact_cpair_iff [simp]: "compact <x, y> = (compact x \<and> compact y)" |
304 |
apply (safe intro!: compact_cpair) |
|
305 |
apply (drule compact_cfst, simp) |
|
306 |
apply (drule compact_csnd, simp) |
|
307 |
done |
|
308 |
||
25905 | 309 |
instance "*" :: (chfin, chfin) chfin |
25921 | 310 |
apply intro_classes |
25905 | 311 |
apply (erule compact_imp_max_in_chain) |
312 |
apply (rule_tac p="\<Squnion>i. Y i" in cprodE, simp) |
|
313 |
done |
|
314 |
||
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315 |
lemma lub_cprod2: |
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316 |
"chain S \<Longrightarrow> range S <<| <\<Squnion>i. cfst\<cdot>(S i), \<Squnion>i. csnd\<cdot>(S i)>" |
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317 |
apply (simp add: cpair_eq_pair cfst_def csnd_def cont_fst cont_snd) |
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318 |
apply (erule lub_cprod) |
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done |
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|
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lemma thelub_cprod2: |
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"chain S \<Longrightarrow> lub (range S) = <\<Squnion>i. cfst\<cdot>(S i), \<Squnion>i. csnd\<cdot>(S i)>" |
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by (rule lub_cprod2 [THEN thelubI]) |
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|
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lemma csplit1 [simp]: "csplit\<cdot>f\<cdot>\<bottom> = f\<cdot>\<bottom>\<cdot>\<bottom>" |
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by (simp add: csplit_def) |
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|
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lemma csplit2 [simp]: "csplit\<cdot>f\<cdot><x,y> = f\<cdot>x\<cdot>y" |
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by (simp add: csplit_def) |
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|
16553 | 331 |
lemma csplit3 [simp]: "csplit\<cdot>cpair\<cdot>z = z" |
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by (simp add: csplit_def cpair_cfst_csnd) |
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|
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lemmas Cprod_rews = cfst_cpair csnd_cpair csplit2 |
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|
25910 | 336 |
subsection {* Product type is a bifinite domain *} |
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||
338 |
instance "*" :: (bifinite_cpo, bifinite_cpo) approx .. |
|
339 |
||
340 |
defs (overloaded) |
|
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approx_cprod_def: |
|
342 |
"approx \<equiv> \<lambda>n. \<Lambda>\<langle>x, y\<rangle>. \<langle>approx n\<cdot>x, approx n\<cdot>y\<rangle>" |
|
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||
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instance "*" :: (bifinite_cpo, bifinite_cpo) bifinite_cpo |
|
345 |
proof |
|
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fix i :: nat and x :: "'a \<times> 'b" |
|
347 |
show "chain (\<lambda>i. approx i\<cdot>x)" |
|
348 |
unfolding approx_cprod_def by simp |
|
349 |
show "(\<Squnion>i. approx i\<cdot>x) = x" |
|
350 |
unfolding approx_cprod_def |
|
351 |
by (simp add: lub_distribs eta_cfun) |
|
352 |
show "approx i\<cdot>(approx i\<cdot>x) = approx i\<cdot>x" |
|
353 |
unfolding approx_cprod_def csplit_def by simp |
|
354 |
have "{x::'a \<times> 'b. approx i\<cdot>x = x} \<subseteq> |
|
355 |
{x::'a. approx i\<cdot>x = x} \<times> {x::'b. approx i\<cdot>x = x}" |
|
356 |
unfolding approx_cprod_def |
|
357 |
by (clarsimp simp add: pair_eq_cpair) |
|
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thus "finite {x::'a \<times> 'b. approx i\<cdot>x = x}" |
|
359 |
by (rule finite_subset, |
|
360 |
intro finite_cartesian_product finite_fixes_approx) |
|
361 |
qed |
|
362 |
||
363 |
instance "*" :: (bifinite, bifinite) bifinite .. |
|
364 |
||
365 |
lemma approx_cpair [simp]: |
|
366 |
"approx i\<cdot>\<langle>x, y\<rangle> = \<langle>approx i\<cdot>x, approx i\<cdot>y\<rangle>" |
|
367 |
unfolding approx_cprod_def by simp |
|
368 |
||
369 |
lemma cfst_approx: "cfst\<cdot>(approx i\<cdot>p) = approx i\<cdot>(cfst\<cdot>p)" |
|
370 |
by (cases p rule: cprodE, simp) |
|
371 |
||
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lemma csnd_approx: "csnd\<cdot>(approx i\<cdot>p) = approx i\<cdot>(csnd\<cdot>p)" |
|
373 |
by (cases p rule: cprodE, simp) |
|
374 |
||
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375 |
end |