author  huffman 
Fri, 03 Jun 2005 23:13:08 +0200  
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child 16388  1ff571813848 
permissions  rwrr 
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(* Title: HOLCF/Cont.thy 
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ID: $Id$ 
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Author: Franz Regensburger 
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removed LICENCE note  everything is subject to Isabelle licence as
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Results about continuity and monotonicity. 
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*) 
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header {* Continuity and monotonicity *} 
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theory Cont 

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imports Ffun 
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begin 
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text {* 
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Now we change the default class! Form now on all untyped type variables are 
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of default class po 
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*} 
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defaultsort po 
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consts 
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monofun :: "('a => 'b) => bool"  "monotonicity" 
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contlub :: "('a::cpo => 'b::cpo) => bool"  "first cont. def" 
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cont :: "('a::cpo => 'b::cpo) => bool"  "secnd cont. def" 
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The curried version of HOLCF is now just called HOLCF. The old
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defs 
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monofun_def: "monofun(f) == ! x y. x << y > f(x) << f(y)" 
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contlub_def: "contlub(f) == ! Y. chain(Y) > 
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f(lub(range(Y))) = lub(range(% i. f(Y(i))))" 
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cont_def: "cont(f) == ! Y. chain(Y) > 
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range(% i. f(Y(i))) << f(lub(range(Y)))" 
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text {* 
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the main purpose of cont.thy is to show: 
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@{prop "monofun(f) & contlub(f) == cont(f)"} 
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*} 
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text {* access to definition *} 
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lemma contlubI: 

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"\<lbrakk>\<And>Y. chain Y \<Longrightarrow> f (\<Squnion>i. Y i) = (\<Squnion>i. f (Y i))\<rbrakk> \<Longrightarrow> contlub f" 
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by (simp add: contlub_def) 
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lemma contlubE: 

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"\<lbrakk>contlub f; chain Y\<rbrakk> \<Longrightarrow> f (\<Squnion>i. Y i) = (\<Squnion>i. f (Y i))" 
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by (simp add: contlub_def) 
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lemma contI: 
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"\<lbrakk>\<And>Y. chain Y \<Longrightarrow> range (\<lambda>i. f (Y i)) << f (\<Squnion>i. Y i)\<rbrakk> \<Longrightarrow> cont f" 
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by (simp add: cont_def) 
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lemma contE: 
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"\<lbrakk>cont f; chain Y\<rbrakk> \<Longrightarrow> range (\<lambda>i. f (Y i)) << f (\<Squnion>i. Y i)" 
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by (simp add: cont_def) 
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lemma monofunI: 

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"\<lbrakk>\<And>x y. x \<sqsubseteq> y \<Longrightarrow> f x \<sqsubseteq> f y\<rbrakk> \<Longrightarrow> monofun f" 
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by (simp add: monofun_def) 
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lemma monofunE: 

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"\<lbrakk>monofun f; x \<sqsubseteq> y\<rbrakk> \<Longrightarrow> f x \<sqsubseteq> f y" 
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by (simp add: monofun_def) 
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text {* monotone functions map chains to chains *} 
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lemma ch2ch_monofun: "\<lbrakk>monofun f; chain Y\<rbrakk> \<Longrightarrow> chain (\<lambda>i. f (Y i))" 
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apply (rule chainI) 
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apply (erule monofunE) 
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apply (erule chainE) 
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done 

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text {* monotone functions map upper bound to upper bounds *} 
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lemma ub2ub_monofun: 

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"\<lbrakk>monofun f; range Y < u\<rbrakk> \<Longrightarrow> range (\<lambda>i. f (Y i)) < f u" 
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apply (rule ub_rangeI) 
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apply (erule monofunE) 
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apply (erule ub_rangeD) 
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done 

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text {* left to right: @{prop "monofun(f) & contlub(f) ==> cont(f)"} *} 
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lemma monocontlub2cont: "\<lbrakk>monofun f; contlub f\<rbrakk> \<Longrightarrow> cont f" 
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apply (rule contI) 
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apply (rule thelubE) 
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apply (erule ch2ch_monofun) 

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apply assumption 

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apply (erule contlubE [symmetric]) 
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apply assumption 
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done 

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text {* first a lemma about binary chains *} 
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lemma binchain_cont: 
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"\<lbrakk>cont f; x \<sqsubseteq> y\<rbrakk> \<Longrightarrow> range (\<lambda>i::nat. f (if i = 0 then x else y)) << f y" 
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apply (subgoal_tac "f (\<Squnion>i::nat. if i = 0 then x else y) = f y") 
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apply (erule subst) 
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apply (erule contE) 
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apply (erule bin_chain) 
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apply (rule_tac f=f in arg_cong) 
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apply (erule lub_bin_chain [THEN thelubI]) 
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done 

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text {* right to left: @{prop "cont f \<Longrightarrow> monofun f \<and> contlub f"} *} 
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text {* part1: @{prop "cont f \<Longrightarrow> monofun f"} *} 
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lemma cont2mono: "cont f \<Longrightarrow> monofun f" 
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apply (rule monofunI) 
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apply (drule binchain_cont, assumption) 
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apply (drule_tac i=0 in is_ub_lub) 
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apply simp 
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done 
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text {* right to left: @{prop "cont f \<Longrightarrow> monofun f \<and> contlub f"} *} 
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text {* part2: @{prop "cont f \<Longrightarrow> contlub f"} *} 
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lemma cont2contlub: "cont(f) ==> contlub(f)" 

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apply (rule contlubI) 
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apply (rule thelubI [symmetric]) 
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apply (erule contE) 
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apply assumption 
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done 

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text {* monotone functions map finite chains to finite chains *} 
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lemma monofun_finch2finch: 
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"\<lbrakk>monofun f; finite_chain Y\<rbrakk> \<Longrightarrow> finite_chain (\<lambda>n. f (Y n))" 
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apply (unfold finite_chain_def) 
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apply (simp add: ch2ch_monofun) 
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apply (force simp add: max_in_chain_def) 
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done 
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text {* The same holds for continuous functions *} 
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lemmas cont_finch2finch = cont2mono [THEN monofun_finch2finch, standard] 

139 
(* [ cont ?f; finite_chain ?Y ] ==> finite_chain (%n. ?f (?Y n)) *) 

140 

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141 
lemma monofun_lub_fun: 
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142 
"\<lbrakk>chain (F::nat \<Rightarrow> 'a \<Rightarrow> 'b::cpo); \<forall>i. monofun (F i)\<rbrakk> 
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143 
\<Longrightarrow> monofun (\<Squnion>i. F i)" 
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144 
apply (rule monofunI) 
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145 
apply (simp add: thelub_fun) 
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146 
apply (rule lub_mono [rule_format]) 
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147 
apply (erule ch2ch_fun) 
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148 
apply (erule ch2ch_fun) 
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149 
apply (simp add: monofunE) 
15565  150 
done 
151 

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152 
text {* the lub of a chain of continuous functions is continuous *} 
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153 

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154 
declare range_composition [simp del] 
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155 

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156 
lemma contlub_lub_fun: 
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157 
"\<lbrakk>chain F; \<forall>i. cont (F i)\<rbrakk> \<Longrightarrow> contlub (\<Squnion>i. F i)" 
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158 
apply (rule contlubI) 
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159 
apply (simp add: thelub_fun) 
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160 
apply (simp add: cont2contlub [THEN contlubE]) 
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161 
apply (rule ex_lub) 
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162 
apply (erule ch2ch_fun) 
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163 
apply (simp add: cont2mono [THEN ch2ch_monofun]) 
15565  164 
done 
165 

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166 
lemma cont_lub_fun: 
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167 
"\<lbrakk>chain F; \<forall>i. cont (F i)\<rbrakk> \<Longrightarrow> cont (\<Squnion>i. F i)" 
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168 
apply (rule monocontlub2cont) 
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169 
apply (erule monofun_lub_fun) 
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170 
apply (simp add: cont2mono) 
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171 
apply (erule contlub_lub_fun) 
15565  172 
apply assumption 
173 
done 

174 

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lemma cont2cont_lub: 
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"\<lbrakk>chain F; \<And>i. cont (F i)\<rbrakk> \<Longrightarrow> cont (\<lambda>x. \<Squnion>i. F i x)" 
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177 
by (simp add: thelub_fun [symmetric] cont_lub_fun) 
15565  178 

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text {* 
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The following results are about application for functions in @{typ "'a=>'b"} 
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181 
*} 
15565  182 

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183 
lemma monofun_fun_fun: "f \<sqsubseteq> g \<Longrightarrow> f x \<sqsubseteq> g x" 
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184 
by (simp add: less_fun_def) 
15565  185 

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186 
lemma monofun_fun_arg: "\<lbrakk>monofun f; x \<sqsubseteq> y\<rbrakk> \<Longrightarrow> f x \<sqsubseteq> f y" 
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187 
by (rule monofunE) 
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188 

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189 
lemma monofun_fun: "\<lbrakk>monofun f; monofun g; f \<sqsubseteq> g; x \<sqsubseteq> y\<rbrakk> \<Longrightarrow> f x \<sqsubseteq> g y" 
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190 
by (rule trans_less [OF monofun_fun_arg monofun_fun_fun]) 
15565  191 

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text {* 
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The following results are about the propagation of monotonicity and 
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continuity 
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195 
*} 
15565  196 

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197 
lemma mono2mono_MF1L: "monofun f \<Longrightarrow> monofun (\<lambda>x. f x y)" 
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198 
apply (rule monofunI) 
15565  199 
apply (erule monofun_fun_arg [THEN monofun_fun_fun]) 
200 
apply assumption 

201 
done 

202 

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203 
lemma cont2cont_CF1L: "cont f \<Longrightarrow> cont (\<lambda>x. f x y)" 
15565  204 
apply (rule monocontlub2cont) 
205 
apply (erule cont2mono [THEN mono2mono_MF1L]) 

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206 
apply (rule contlubI) 
15565  207 
apply (frule asm_rl) 
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208 
apply (erule cont2contlub [THEN contlubE, THEN ssubst]) 
15565  209 
apply assumption 
210 
apply (subst thelub_fun) 

211 
apply (rule ch2ch_monofun) 

212 
apply (erule cont2mono) 

213 
apply assumption 

214 
apply (rule refl) 

215 
done 

216 

217 
(********* Note "(%x.%y.c1 x y) = c1" ***********) 

218 

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lemma mono2mono_MF1L_rev: "\<forall>y. monofun (\<lambda>x. f x y) \<Longrightarrow> monofun f" 
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220 
apply (rule monofunI) 
15565  221 
apply (rule less_fun [THEN iffD2]) 
222 
apply (blast dest: monofunE) 

223 
done 

224 

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225 
lemma cont2cont_CF1L_rev: "\<forall>y. cont (\<lambda>x. f x y) \<Longrightarrow> cont f" 
15565  226 
apply (rule monocontlub2cont) 
227 
apply (rule cont2mono [THEN allI, THEN mono2mono_MF1L_rev]) 

228 
apply (erule spec) 

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229 
apply (rule contlubI) 
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apply (rule ext) 
231 
apply (subst thelub_fun) 

232 
apply (rule cont2mono [THEN allI, THEN mono2mono_MF1L_rev, THEN ch2ch_monofun]) 

233 
apply (erule spec) 

234 
apply assumption 

235 
apply (blast dest: cont2contlub [THEN contlubE]) 

236 
done 

237 

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238 
lemma cont2cont_CF1L_rev2: "(\<And>y. cont (\<lambda>x. f x y)) \<Longrightarrow> cont f" 
16053  239 
apply (rule cont2cont_CF1L_rev) 
240 
apply simp 

241 
done 

242 

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text {* 
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What D.A.Schmidt calls continuity of abstraction 
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never used here 
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*} 
15565  247 

248 
lemma contlub_abstraction: 

249 
"[chain(Y::nat=>'a);!y. cont(%x.(c::'a::cpo=>'b::cpo=>'c::cpo) x y)] ==> 

250 
(%y. lub(range(%i. c (Y i) y))) = (lub(range(%i.%y. c (Y i) y)))" 

251 
apply (rule trans) 

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252 
prefer 2 apply (rule cont2contlub [THEN contlubE]) 
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prefer 2 apply (assumption) 
254 
apply (erule cont2cont_CF1L_rev) 

255 
apply (rule ext) 

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256 
apply (rule cont2contlub [THEN contlubE, symmetric]) 
15565  257 
apply (erule spec) 
258 
apply assumption 

259 
done 

260 

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lemma mono2mono_app: 
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"\<lbrakk>monofun f; \<forall>x. monofun (f x); monofun t\<rbrakk> \<Longrightarrow> monofun (\<lambda>x. (f x) (t x))" 
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263 
apply (rule monofunI) 
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apply (simp add: monofun_fun monofunE) 
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done 
266 

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lemma cont2contlub_app: 
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"\<lbrakk>cont f; \<forall>x. cont (f x); cont t\<rbrakk> \<Longrightarrow> contlub (\<lambda>x. (f x) (t x))" 
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269 
apply (rule contlubI) 
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apply (subgoal_tac "chain (\<lambda>i. f (Y i))") 
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apply (subgoal_tac "chain (\<lambda>i. t (Y i))") 
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apply (simp add: cont2contlub [THEN contlubE] thelub_fun) 
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apply (rule diag_lub) 
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apply (erule ch2ch_fun) 
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apply (drule spec) 
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apply (erule cont2mono [THEN ch2ch_monofun], assumption) 
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apply (erule cont2mono [THEN ch2ch_monofun], assumption) 
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apply (erule cont2mono [THEN ch2ch_monofun], assumption) 
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done 
280 

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lemma cont2cont_app: 
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"\<lbrakk>cont f; \<forall>x. cont (f x); cont t\<rbrakk> \<Longrightarrow> cont (\<lambda>x. (f x) (t x))" 
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by (blast intro: monocontlub2cont mono2mono_app cont2mono cont2contlub_app) 
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lemmas cont2cont_app2 = cont2cont_app[OF _ allI] 

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(* [ cont ?ft; !!x. cont (?ft x); cont ?tt ] ==> *) 

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(* cont (%x. ?ft x (?tt x)) *) 

288 

289 

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text {* The identity function is continuous *} 
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lemma cont_id: "cont (\<lambda>x. x)" 
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apply (rule contI) 
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apply (erule thelubE) 
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apply (rule refl) 

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done 

297 

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text {* constant functions are continuous *} 
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lemma cont_const: "cont (\<lambda>x. c)" 
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apply (rule contI) 
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apply (rule lub_const) 
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done 
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lemma cont2cont_app3: "[cont(f); cont(t) ] ==> cont(%x. f(t(x)))" 
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by (best intro: cont2cont_app2 cont_const) 
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text {* some properties of flat *} 
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lemma flatdom2monofun: "f \<bottom> = \<bottom> \<Longrightarrow> monofun (f::'a::flat \<Rightarrow> 'b::pcpo)" 
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apply (rule monofunI) 
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apply (drule ax_flat [rule_format]) 
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apply auto 
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done 

315 

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lemma chfindom_monofun2cont: "monofun f \<Longrightarrow> cont (f::'a::chfin \<Rightarrow> 'b::pcpo)" 
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apply (rule monocontlub2cont) 
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apply assumption 

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apply (rule contlubI) 
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apply (frule chfin2finch) 
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apply (clarsimp simp add: finite_chain_def) 
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apply (subgoal_tac "max_in_chain i (\<lambda>i. f (Y i))") 
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apply (simp add: maxinch_is_thelub ch2ch_monofun) 
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apply (force simp add: max_in_chain_def) 
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done 
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lemmas flatdom_strict2cont = flatdom2monofun [THEN chfindom_monofun2cont, standard] 

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(* f UU = UU ==> cont (f::'a=>'b::pcpo)" *) 

329 

243
c22b85994e17
Franz Regensburger's HigherOrder Logic of Computable Functions embedding LCF
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end 