author  paulson 
Fri, 05 Oct 2007 09:59:03 +0200  
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parent 23152  9497234a2743 
child 25131  2c8caac48ade 
permissions  rwrr 
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(* Title: HOLCF/Cfun.thy 
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ID: $Id$ 
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Author: Franz Regensburger 
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Definition of the type > of continuous functions. 
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*) 
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header {* The type of continuous functions *} 
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theory Cfun 
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imports Pcpodef 
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uses ("Tools/cont_proc.ML") 
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begin 
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defaultsort cpo 
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subsection {* Definition of continuous function type *} 
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lemma Ex_cont: "\<exists>f. cont f" 
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by (rule exI, rule cont_const) 

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lemma adm_cont: "adm cont" 

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by (rule admI, rule cont_lub_fun) 

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cpodef (CFun) ('a, 'b) ">" (infixr ">" 0) = "{f::'a => 'b. cont f}" 
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by (simp add: Ex_cont adm_cont) 
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syntax (xsymbols) 
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">" :: "[type, type] => type" ("(_ \<rightarrow>/ _)" [1,0]0) 
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syntax 
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Rep_CFun :: "('a \<rightarrow> 'b) \<Rightarrow> ('a \<Rightarrow> 'b)" ("(_$/_)" [999,1000] 999) 
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syntax (xsymbols) 
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Rep_CFun :: "('a \<rightarrow> 'b) \<Rightarrow> ('a \<Rightarrow> 'b)" ("(_\<cdot>/_)" [999,1000] 999) 
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syntax (HTML output) 
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Rep_CFun :: "('a \<rightarrow> 'b) \<Rightarrow> ('a \<Rightarrow> 'b)" ("(_\<cdot>/_)" [999,1000] 999) 
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subsection {* Syntax for continuous lambda abstraction *} 
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syntax "_cabs" :: "'a" 
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parse_translation {* 
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(* rewrites (_cabs x t) => (Abs_CFun (%x. t)) *) 
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[mk_binder_tr ("_cabs", "Abs_CFun")]; 
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*} 
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text {* To avoid etacontraction of body: *} 
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typed_print_translation {* 
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let 
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fun cabs_tr' _ _ [Abs abs] = let 
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val (x,t) = atomic_abs_tr' abs 

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in Syntax.const "_cabs" $ x $ t end 

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 cabs_tr' _ T [t] = let 

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val xT = domain_type (domain_type T); 

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val abs' = ("x",xT,(incr_boundvars 1 t)$Bound 0); 

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val (x,t') = atomic_abs_tr' abs'; 

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in Syntax.const "_cabs" $ x $ t' end; 

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in [("Abs_CFun", cabs_tr')] end; 
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*} 
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text {* Syntax for nested abstractions *} 
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syntax 
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"_Lambda" :: "[cargs, 'a] \<Rightarrow> logic" ("(3LAM _./ _)" [1000, 10] 10) 
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syntax (xsymbols) 
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"_Lambda" :: "[cargs, 'a] \<Rightarrow> logic" ("(3\<Lambda>_./ _)" [1000, 10] 10) 
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parse_ast_translation {* 
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(* rewrites (LAM x y z. t) => (_cabs x (_cabs y (_cabs z t))) *) 
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(* cf. Syntax.lambda_ast_tr from Syntax/syn_trans.ML *) 
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let 
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fun Lambda_ast_tr [pats, body] = 
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Syntax.fold_ast_p "_cabs" (Syntax.unfold_ast "_cargs" pats, body) 
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 Lambda_ast_tr asts = raise Syntax.AST ("Lambda_ast_tr", asts); 
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in [("_Lambda", Lambda_ast_tr)] end; 
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*} 
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print_ast_translation {* 
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(* rewrites (_cabs x (_cabs y (_cabs z t))) => (LAM x y z. t) *) 
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(* cf. Syntax.abs_ast_tr' from Syntax/syn_trans.ML *) 
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let 
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fun cabs_ast_tr' asts = 
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(case Syntax.unfold_ast_p "_cabs" 
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(Syntax.Appl (Syntax.Constant "_cabs" :: asts)) of 
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([], _) => raise Syntax.AST ("cabs_ast_tr'", asts) 
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 (xs, body) => Syntax.Appl 
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[Syntax.Constant "_Lambda", Syntax.fold_ast "_cargs" xs, body]); 
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in [("_cabs", cabs_ast_tr')] end; 
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*} 
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text {* Dummy patterns for continuous abstraction *} 
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translations 
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"\<Lambda> _. t" => "Abs_CFun (\<lambda> _. t)" 
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subsection {* Continuous function space is pointed *} 
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lemma UU_CFun: "\<bottom> \<in> CFun" 
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by (simp add: CFun_def inst_fun_pcpo cont_const) 

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instance ">" :: (cpo, pcpo) pcpo 

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by (rule typedef_pcpo [OF type_definition_CFun less_CFun_def UU_CFun]) 
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lemmas Rep_CFun_strict = 
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typedef_Rep_strict [OF type_definition_CFun less_CFun_def UU_CFun] 
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lemmas Abs_CFun_strict = 
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typedef_Abs_strict [OF type_definition_CFun less_CFun_def UU_CFun] 
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text {* function application is strict in its first argument *} 
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lemma Rep_CFun_strict1 [simp]: "\<bottom>\<cdot>x = \<bottom>" 
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by (simp add: Rep_CFun_strict) 
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text {* for compatibility with old HOLCFVersion *} 
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lemma inst_cfun_pcpo: "\<bottom> = (\<Lambda> x. \<bottom>)" 
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by (simp add: inst_fun_pcpo [symmetric] Abs_CFun_strict) 
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subsection {* Basic properties of continuous functions *} 
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text {* Betaequality for continuous functions *} 
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lemma Abs_CFun_inverse2: "cont f \<Longrightarrow> Rep_CFun (Abs_CFun f) = f" 
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by (simp add: Abs_CFun_inverse CFun_def) 
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lemma beta_cfun [simp]: "cont f \<Longrightarrow> (\<Lambda> x. f x)\<cdot>u = f u" 
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by (simp add: Abs_CFun_inverse2) 
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text {* Etaequality for continuous functions *} 
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lemma eta_cfun: "(\<Lambda> x. f\<cdot>x) = f" 
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by (rule Rep_CFun_inverse) 
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text {* Extensionality for continuous functions *} 
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lemma expand_cfun_eq: "(f = g) = (\<forall>x. f\<cdot>x = g\<cdot>x)" 
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by (simp add: Rep_CFun_inject [symmetric] expand_fun_eq) 
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lemma ext_cfun: "(\<And>x. f\<cdot>x = g\<cdot>x) \<Longrightarrow> f = g" 
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by (simp add: expand_cfun_eq) 
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text {* Extensionality wrt. ordering for continuous functions *} 
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lemma expand_cfun_less: "f \<sqsubseteq> g = (\<forall>x. f\<cdot>x \<sqsubseteq> g\<cdot>x)" 
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by (simp add: less_CFun_def expand_fun_less) 
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lemma less_cfun_ext: "(\<And>x. f\<cdot>x \<sqsubseteq> g\<cdot>x) \<Longrightarrow> f \<sqsubseteq> g" 
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by (simp add: expand_cfun_less) 
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text {* Congruence for continuous function application *} 
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lemma cfun_cong: "\<lbrakk>f = g; x = y\<rbrakk> \<Longrightarrow> f\<cdot>x = g\<cdot>y" 
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by simp 
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lemma cfun_fun_cong: "f = g \<Longrightarrow> f\<cdot>x = g\<cdot>x" 
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by simp 
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lemma cfun_arg_cong: "x = y \<Longrightarrow> f\<cdot>x = f\<cdot>y" 
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by simp 
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subsection {* Continuity of application *} 
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lemma cont_Rep_CFun1: "cont (\<lambda>f. f\<cdot>x)" 
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by (rule cont_Rep_CFun [THEN cont2cont_fun]) 
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lemma cont_Rep_CFun2: "cont (\<lambda>x. f\<cdot>x)" 
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apply (cut_tac x=f in Rep_CFun) 
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apply (simp add: CFun_def) 
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done 
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lemmas monofun_Rep_CFun = cont_Rep_CFun [THEN cont2mono] 
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lemmas contlub_Rep_CFun = cont_Rep_CFun [THEN cont2contlub] 
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lemmas monofun_Rep_CFun1 = cont_Rep_CFun1 [THEN cont2mono, standard] 
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lemmas contlub_Rep_CFun1 = cont_Rep_CFun1 [THEN cont2contlub, standard] 
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lemmas monofun_Rep_CFun2 = cont_Rep_CFun2 [THEN cont2mono, standard] 
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lemmas contlub_Rep_CFun2 = cont_Rep_CFun2 [THEN cont2contlub, standard] 
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183 

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text {* contlub, cont properties of @{term Rep_CFun} in each argument *} 
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lemma contlub_cfun_arg: "chain Y \<Longrightarrow> f\<cdot>(lub (range Y)) = (\<Squnion>i. f\<cdot>(Y i))" 
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by (rule contlub_Rep_CFun2 [THEN contlubE]) 
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lemma cont_cfun_arg: "chain Y \<Longrightarrow> range (\<lambda>i. f\<cdot>(Y i)) << f\<cdot>(lub (range Y))" 
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by (rule cont_Rep_CFun2 [THEN contE]) 
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lemma contlub_cfun_fun: "chain F \<Longrightarrow> lub (range F)\<cdot>x = (\<Squnion>i. F i\<cdot>x)" 
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by (rule contlub_Rep_CFun1 [THEN contlubE]) 
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lemma cont_cfun_fun: "chain F \<Longrightarrow> range (\<lambda>i. F i\<cdot>x) << lub (range F)\<cdot>x" 
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by (rule cont_Rep_CFun1 [THEN contE]) 
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text {* monotonicity of application *} 
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lemma monofun_cfun_fun: "f \<sqsubseteq> g \<Longrightarrow> f\<cdot>x \<sqsubseteq> g\<cdot>x" 
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by (simp add: expand_cfun_less) 
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202 

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lemma monofun_cfun_arg: "x \<sqsubseteq> y \<Longrightarrow> f\<cdot>x \<sqsubseteq> f\<cdot>y" 
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by (rule monofun_Rep_CFun2 [THEN monofunE]) 
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lemma monofun_cfun: "\<lbrakk>f \<sqsubseteq> g; x \<sqsubseteq> y\<rbrakk> \<Longrightarrow> f\<cdot>x \<sqsubseteq> g\<cdot>y" 
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by (rule trans_less [OF monofun_cfun_fun monofun_cfun_arg]) 
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text {* ch2ch  rules for the type @{typ "'a > 'b"} *} 
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210 

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lemma chain_monofun: "chain Y \<Longrightarrow> chain (\<lambda>i. f\<cdot>(Y i))" 
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by (erule monofun_Rep_CFun2 [THEN ch2ch_monofun]) 
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lemma ch2ch_Rep_CFunR: "chain Y \<Longrightarrow> chain (\<lambda>i. f\<cdot>(Y i))" 
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by (rule monofun_Rep_CFun2 [THEN ch2ch_monofun]) 
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lemma ch2ch_Rep_CFunL: "chain F \<Longrightarrow> chain (\<lambda>i. (F i)\<cdot>x)" 
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by (rule monofun_Rep_CFun1 [THEN ch2ch_monofun]) 
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18076  220 
lemma ch2ch_Rep_CFun [simp]: 
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"\<lbrakk>chain F; chain Y\<rbrakk> \<Longrightarrow> chain (\<lambda>i. (F i)\<cdot>(Y i))" 

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apply (rule chainI) 
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apply (rule monofun_cfun) 
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apply (erule chainE) 
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apply (erule chainE) 
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done 
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227 

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lemma ch2ch_LAM: "\<lbrakk>\<And>x. chain (\<lambda>i. S i x); \<And>i. cont (\<lambda>x. S i x)\<rbrakk> 
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\<Longrightarrow> chain (\<lambda>i. \<Lambda> x. S i x)" 
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by (simp add: chain_def expand_cfun_less) 
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text {* contlub, cont properties of @{term Rep_CFun} in both arguments *} 
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lemma contlub_cfun: 
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"\<lbrakk>chain F; chain Y\<rbrakk> \<Longrightarrow> (\<Squnion>i. F i)\<cdot>(\<Squnion>i. Y i) = (\<Squnion>i. F i\<cdot>(Y i))" 
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by (simp add: contlub_cfun_fun contlub_cfun_arg diag_lub) 
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lemma cont_cfun: 
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"\<lbrakk>chain F; chain Y\<rbrakk> \<Longrightarrow> range (\<lambda>i. F i\<cdot>(Y i)) << (\<Squnion>i. F i)\<cdot>(\<Squnion>i. Y i)" 
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apply (rule thelubE) 
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apply (simp only: ch2ch_Rep_CFun) 
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apply (simp only: contlub_cfun) 
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done 
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244 

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lemma contlub_LAM: 
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"\<lbrakk>\<And>x. chain (\<lambda>i. F i x); \<And>i. cont (\<lambda>x. F i x)\<rbrakk> 
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\<Longrightarrow> (\<Lambda> x. \<Squnion>i. F i x) = (\<Squnion>i. \<Lambda> x. F i x)" 
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apply (simp add: thelub_CFun ch2ch_LAM) 
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apply (simp add: Abs_CFun_inverse2) 
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apply (simp add: thelub_fun ch2ch_lambda) 
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done 
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text {* strictness *} 
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254 

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lemma strictI: "f\<cdot>x = \<bottom> \<Longrightarrow> f\<cdot>\<bottom> = \<bottom>" 
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apply (rule UU_I) 
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apply (erule subst) 
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apply (rule minimal [THEN monofun_cfun_arg]) 
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done 
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260 

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text {* the lub of a chain of continous functions is monotone *} 
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262 

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lemma lub_cfun_mono: "chain F \<Longrightarrow> monofun (\<lambda>x. \<Squnion>i. F i\<cdot>x)" 
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264 
apply (drule ch2ch_monofun [OF monofun_Rep_CFun]) 
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265 
apply (simp add: thelub_fun [symmetric]) 
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266 
apply (erule monofun_lub_fun) 
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apply (simp add: monofun_Rep_CFun2) 
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done 
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16386  270 
text {* a lemma about the exchange of lubs for type @{typ "'a > 'b"} *} 
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16699  272 
lemma ex_lub_cfun: 
273 
"\<lbrakk>chain F; chain Y\<rbrakk> \<Longrightarrow> (\<Squnion>j. \<Squnion>i. F j\<cdot>(Y i)) = (\<Squnion>i. \<Squnion>j. F j\<cdot>(Y i))" 

18076  274 
by (simp add: diag_lub) 
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text {* the lub of a chain of cont. functions is continuous *} 
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lemma cont_lub_cfun: "chain F \<Longrightarrow> cont (\<lambda>x. \<Squnion>i. F i\<cdot>x)" 
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279 
apply (rule cont2cont_lub) 
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280 
apply (erule monofun_Rep_CFun [THEN ch2ch_monofun]) 
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apply (rule cont_Rep_CFun2) 
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done 
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283 

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text {* type @{typ "'a > 'b"} is chain complete *} 
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285 

16920  286 
lemma lub_cfun: "chain F \<Longrightarrow> range F << (\<Lambda> x. \<Squnion>i. F i\<cdot>x)" 
287 
by (simp only: contlub_cfun_fun [symmetric] eta_cfun thelubE) 

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16920  289 
lemma thelub_cfun: "chain F \<Longrightarrow> lub (range F) = (\<Lambda> x. \<Squnion>i. F i\<cdot>x)" 
290 
by (rule lub_cfun [THEN thelubI]) 

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292 
subsection {* Continuity simplification procedure *} 
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293 

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text {* cont2cont lemma for @{term Rep_CFun} *} 
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296 
lemma cont2cont_Rep_CFun: 
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"\<lbrakk>cont f; cont t\<rbrakk> \<Longrightarrow> cont (\<lambda>x. (f x)\<cdot>(t x))" 
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by (best intro: cont2cont_app2 cont_const cont_Rep_CFun cont_Rep_CFun2) 
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text {* cont2mono Lemma for @{term "%x. LAM y. c1(x)(y)"} *} 
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lemma cont2mono_LAM: 
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assumes p1: "!!x. cont(c1 x)" 
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assumes p2: "!!y. monofun(%x. c1 x y)" 
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shows "monofun(%x. LAM y. c1 x y)" 
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306 
apply (rule monofunI) 
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307 
apply (rule less_cfun_ext) 
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308 
apply (simp add: p1) 
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apply (erule p2 [THEN monofunE]) 
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done 
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311 

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text {* cont2cont Lemma for @{term "%x. LAM y. c1 x y"} *} 
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lemma cont2cont_LAM: 
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assumes p1: "!!x. cont(c1 x)" 
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assumes p2: "!!y. cont(%x. c1 x y)" 
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shows "cont(%x. LAM y. c1 x y)" 
16098  318 
apply (rule cont_Abs_CFun) 
319 
apply (simp add: p1 CFun_def) 

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apply (simp add: p2 cont2cont_lambda) 
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done 
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16386  323 
text {* continuity simplification procedure *} 
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16055  325 
lemmas cont_lemmas1 = 
326 
cont_const cont_id cont_Rep_CFun2 cont2cont_Rep_CFun cont2cont_LAM 

327 

23152  328 
use "Tools/cont_proc.ML"; 
16386  329 
setup ContProc.setup; 
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(*val cont_tac = (fn i => (resolve_tac cont_lemmas i));*) 
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(*val cont_tacR = (fn i => (REPEAT (cont_tac i)));*) 
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333 

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334 
subsection {* Miscellaneous *} 
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335 

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text {* Monotonicity of @{term Abs_CFun} *} 
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337 

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338 
lemma semi_monofun_Abs_CFun: 
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339 
"\<lbrakk>cont f; cont g; f \<sqsubseteq> g\<rbrakk> \<Longrightarrow> Abs_CFun f \<sqsubseteq> Abs_CFun g" 
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340 
by (simp add: less_CFun_def Abs_CFun_inverse2) 
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341 

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text {* some lemmata for functions with flat/chfin domain/range types *} 
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343 

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lemma chfin_Rep_CFunR: "chain (Y::nat => 'a::cpo>'b::chfin) 
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==> !s. ? n. lub(range(Y))$s = Y n$s" 
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346 
apply (rule allI) 
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347 
apply (subst contlub_cfun_fun) 
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apply assumption 
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apply (fast intro!: thelubI chfin lub_finch2 chfin2finch ch2ch_Rep_CFunL) 
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350 
done 
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351 

18089  352 
lemma adm_chfindom: "adm (\<lambda>(u::'a::cpo \<rightarrow> 'b::chfin). P(u\<cdot>s))" 
353 
by (rule adm_subst, simp, rule adm_chfin) 

354 

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355 
subsection {* Continuous injectionretraction pairs *} 
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356 

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357 
text {* Continuous retractions are strict. *} 
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358 

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359 
lemma retraction_strict: 
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360 
"\<forall>x. f\<cdot>(g\<cdot>x) = x \<Longrightarrow> f\<cdot>\<bottom> = \<bottom>" 
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361 
apply (rule UU_I) 
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362 
apply (drule_tac x="\<bottom>" in spec) 
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363 
apply (erule subst) 
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364 
apply (rule monofun_cfun_arg) 
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365 
apply (rule minimal) 
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366 
done 
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367 

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368 
lemma injection_eq: 
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369 
"\<forall>x. f\<cdot>(g\<cdot>x) = x \<Longrightarrow> (g\<cdot>x = g\<cdot>y) = (x = y)" 
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370 
apply (rule iffI) 
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371 
apply (drule_tac f=f in cfun_arg_cong) 
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372 
apply simp 
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373 
apply simp 
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374 
done 
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375 

16314  376 
lemma injection_less: 
377 
"\<forall>x. f\<cdot>(g\<cdot>x) = x \<Longrightarrow> (g\<cdot>x \<sqsubseteq> g\<cdot>y) = (x \<sqsubseteq> y)" 

378 
apply (rule iffI) 

379 
apply (drule_tac f=f in monofun_cfun_arg) 

380 
apply simp 

381 
apply (erule monofun_cfun_arg) 

382 
done 

383 

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384 
lemma injection_defined_rev: 
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385 
"\<lbrakk>\<forall>x. f\<cdot>(g\<cdot>x) = x; g\<cdot>z = \<bottom>\<rbrakk> \<Longrightarrow> z = \<bottom>" 
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386 
apply (drule_tac f=f in cfun_arg_cong) 
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387 
apply (simp add: retraction_strict) 
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388 
done 
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389 

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390 
lemma injection_defined: 
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391 
"\<lbrakk>\<forall>x. f\<cdot>(g\<cdot>x) = x; z \<noteq> \<bottom>\<rbrakk> \<Longrightarrow> g\<cdot>z \<noteq> \<bottom>" 
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392 
by (erule contrapos_nn, rule injection_defined_rev) 
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393 

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394 
text {* propagation of flatness and chainfiniteness by retractions *} 
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395 

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396 
lemma chfin2chfin: 
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397 
"\<forall>y. (f::'a::chfin \<rightarrow> 'b)\<cdot>(g\<cdot>y) = y 
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398 
\<Longrightarrow> \<forall>Y::nat \<Rightarrow> 'b. chain Y \<longrightarrow> (\<exists>n. max_in_chain n Y)" 
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399 
apply clarify 
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400 
apply (drule_tac f=g in chain_monofun) 
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401 
apply (drule chfin [rule_format]) 
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402 
apply (unfold max_in_chain_def) 
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403 
apply (simp add: injection_eq) 
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404 
done 
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405 

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406 
lemma flat2flat: 
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407 
"\<forall>y. (f::'a::flat \<rightarrow> 'b::pcpo)\<cdot>(g\<cdot>y) = y 
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408 
\<Longrightarrow> \<forall>x y::'b. x \<sqsubseteq> y \<longrightarrow> x = \<bottom> \<or> x = y" 
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409 
apply clarify 
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410 
apply (drule_tac f=g in monofun_cfun_arg) 
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411 
apply (drule ax_flat [rule_format]) 
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412 
apply (erule disjE) 
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413 
apply (simp add: injection_defined_rev) 
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414 
apply (simp add: injection_eq) 
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415 
done 
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416 

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417 
text {* a result about functions with flat codomain *} 
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418 

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419 
lemma flat_eqI: "\<lbrakk>(x::'a::flat) \<sqsubseteq> y; x \<noteq> \<bottom>\<rbrakk> \<Longrightarrow> x = y" 
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420 
by (drule ax_flat [rule_format], simp) 
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421 

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422 
lemma flat_codom: 
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423 
"f\<cdot>x = (c::'b::flat) \<Longrightarrow> f\<cdot>\<bottom> = \<bottom> \<or> (\<forall>z. f\<cdot>z = c)" 
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424 
apply (case_tac "f\<cdot>x = \<bottom>") 
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425 
apply (rule disjI1) 
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426 
apply (rule UU_I) 
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427 
apply (erule_tac t="\<bottom>" in subst) 
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428 
apply (rule minimal [THEN monofun_cfun_arg]) 
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429 
apply clarify 
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430 
apply (rule_tac a = "f\<cdot>\<bottom>" in refl [THEN box_equals]) 
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431 
apply (erule minimal [THEN monofun_cfun_arg, THEN flat_eqI]) 
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432 
apply (erule minimal [THEN monofun_cfun_arg, THEN flat_eqI]) 
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433 
done 
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434 

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435 

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436 
subsection {* Identity and composition *} 
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437 

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438 
consts 
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439 
ID :: "'a \<rightarrow> 'a" 
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440 
cfcomp :: "('b \<rightarrow> 'c) \<rightarrow> ('a \<rightarrow> 'b) \<rightarrow> 'a \<rightarrow> 'c" 
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441 

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442 
syntax "@oo" :: "['b \<rightarrow> 'c, 'a \<rightarrow> 'b] \<Rightarrow> 'a \<rightarrow> 'c" (infixr "oo" 100) 
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443 

18076  444 
translations "f oo g" == "cfcomp\<cdot>f\<cdot>g" 
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445 

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446 
defs 
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447 
ID_def: "ID \<equiv> (\<Lambda> x. x)" 
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448 
oo_def: "cfcomp \<equiv> (\<Lambda> f g x. f\<cdot>(g\<cdot>x))" 
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449 

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450 
lemma ID1 [simp]: "ID\<cdot>x = x" 
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451 
by (simp add: ID_def) 
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452 

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453 
lemma cfcomp1: "(f oo g) = (\<Lambda> x. f\<cdot>(g\<cdot>x))" 
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454 
by (simp add: oo_def) 
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455 

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456 
lemma cfcomp2 [simp]: "(f oo g)\<cdot>x = f\<cdot>(g\<cdot>x)" 
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457 
by (simp add: cfcomp1) 
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458 

19709  459 
lemma cfcomp_strict [simp]: "\<bottom> oo f = \<bottom>" 
460 
by (simp add: expand_cfun_eq) 

461 

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462 
text {* 
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463 
Show that interpretation of (pcpo,@{text "_>_"}) is a category. 
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464 
The class of objects is interpretation of syntactical class pcpo. 
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465 
The class of arrows between objects @{typ 'a} and @{typ 'b} is interpret. of @{typ "'a > 'b"}. 
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466 
The identity arrow is interpretation of @{term ID}. 
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467 
The composition of f and g is interpretation of @{text "oo"}. 
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468 
*} 
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469 

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470 
lemma ID2 [simp]: "f oo ID = f" 
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471 
by (rule ext_cfun, simp) 
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472 

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473 
lemma ID3 [simp]: "ID oo f = f" 
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474 
by (rule ext_cfun, simp) 
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475 

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476 
lemma assoc_oo: "f oo (g oo h) = (f oo g) oo h" 
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477 
by (rule ext_cfun, simp) 
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478 

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479 

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480 
subsection {* Strictified functions *} 
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481 

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482 
defaultsort pcpo 
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483 

17815  484 
constdefs 
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485 
strictify :: "('a \<rightarrow> 'b) \<rightarrow> 'a \<rightarrow> 'b" 
17815  486 
"strictify \<equiv> (\<Lambda> f x. if x = \<bottom> then \<bottom> else f\<cdot>x)" 
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487 

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488 
text {* results about strictify *} 
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489 

17815  490 
lemma cont_strictify1: "cont (\<lambda>f. if x = \<bottom> then \<bottom> else f\<cdot>x)" 
491 
by (simp add: cont_if) 

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492 

17815  493 
lemma monofun_strictify2: "monofun (\<lambda>x. if x = \<bottom> then \<bottom> else f\<cdot>x)" 
494 
apply (rule monofunI) 

495 
apply (auto simp add: monofun_cfun_arg eq_UU_iff [symmetric]) 

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496 
done 
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497 

17815  498 
(*FIXME: long proof*) 
499 
lemma contlub_strictify2: "contlub (\<lambda>x. if x = \<bottom> then \<bottom> else f\<cdot>x)" 

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500 
apply (rule contlubI) 
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501 
apply (case_tac "lub (range Y) = \<bottom>") 
16699  502 
apply (drule (1) chain_UU_I) 
18076  503 
apply simp 
17815  504 
apply (simp del: if_image_distrib) 
505 
apply (simp only: contlub_cfun_arg) 

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506 
apply (rule lub_equal2) 
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507 
apply (rule chain_mono2 [THEN exE]) 
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508 
apply (erule chain_UU_I_inverse2) 
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509 
apply (assumption) 
17815  510 
apply (rule_tac x=x in exI, clarsimp) 
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511 
apply (erule chain_monofun) 
17815  512 
apply (erule monofun_strictify2 [THEN ch2ch_monofun]) 
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513 
done 
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514 

17815  515 
lemmas cont_strictify2 = 
516 
monocontlub2cont [OF monofun_strictify2 contlub_strictify2, standard] 

517 

518 
lemma strictify_conv_if: "strictify\<cdot>f\<cdot>x = (if x = \<bottom> then \<bottom> else f\<cdot>x)" 

519 
by (unfold strictify_def, simp add: cont_strictify1 cont_strictify2) 

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520 

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521 
lemma strictify1 [simp]: "strictify\<cdot>f\<cdot>\<bottom> = \<bottom>" 
17815  522 
by (simp add: strictify_conv_if) 
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523 

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524 
lemma strictify2 [simp]: "x \<noteq> \<bottom> \<Longrightarrow> strictify\<cdot>f\<cdot>x = f\<cdot>x" 
17815  525 
by (simp add: strictify_conv_if) 
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526 

17816
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527 
subsection {* Continuous letbindings *} 
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528 

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529 
constdefs 
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530 
CLet :: "'a \<rightarrow> ('a \<rightarrow> 'b) \<rightarrow> 'b" 
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changeset

531 
"CLet \<equiv> \<Lambda> s f. f\<cdot>s" 
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532 

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533 
syntax 
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534 
"_CLet" :: "[letbinds, 'a] => 'a" ("(Let (_)/ in (_))" 10) 
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535 

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536 
translations 
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537 
"_CLet (_binds b bs) e" == "_CLet b (_CLet bs e)" 
18076  538 
"Let x = a in e" == "CLet\<cdot>a\<cdot>(\<Lambda> x. e)" 
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539 

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540 
end 