author | oheimb |
Tue, 24 Apr 2001 14:26:05 +0200 | |
changeset 11266 | 70c9ebbffc49 |
parent 11088 | 08690b7c0568 |
child 11284 | 981ea92a86dd |
permissions | -rw-r--r-- |
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(* Title: HOL/MicroJava/J/TypeRel.thy |
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ID: $Id$ |
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Author: David von Oheimb |
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Copyright 1999 Technische Universitaet Muenchen |
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*) |
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header "Relations between Java Types" |
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theory TypeRel = Decl: |
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consts |
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subcls1 :: "'c prog => (cname \<times> cname) set" (* subclass *) |
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widen :: "'c prog => (ty \<times> ty ) set" (* widening *) |
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cast :: "'c prog => (cname \<times> cname) set" (* casting *) |
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syntax |
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subcls1 :: "'c prog => [cname, cname] => bool" ("_ \<turnstile> _ \<prec>C1 _" [71,71,71] 70) |
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subcls :: "'c prog => [cname, cname] => bool" ("_ \<turnstile> _ \<preceq>C _" [71,71,71] 70) |
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widen :: "'c prog => [ty , ty ] => bool" ("_ \<turnstile> _ \<preceq> _" [71,71,71] 70) |
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cast :: "'c prog => [cname, cname] => bool" ("_ \<turnstile> _ \<preceq>? _" [71,71,71] 70) |
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syntax (HTML) |
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subcls1 :: "'c prog => [cname, cname] => bool" ("_ |- _ <=C1 _" [71,71,71] 70) |
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subcls :: "'c prog => [cname, cname] => bool" ("_ |- _ <=C _" [71,71,71] 70) |
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widen :: "'c prog => [ty , ty ] => bool" ("_ |- _ <= _" [71,71,71] 70) |
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cast :: "'c prog => [cname, cname] => bool" ("_ |- _ <=? _" [71,71,71] 70) |
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translations |
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"G\<turnstile>C \<prec>C1 D" == "(C,D) \<in> subcls1 G" |
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"G\<turnstile>C \<preceq>C D" == "(C,D) \<in> (subcls1 G)^*" |
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"G\<turnstile>S \<preceq> T" == "(S,T) \<in> widen G" |
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"G\<turnstile>C \<preceq>? D" == "(C,D) \<in> cast G" |
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defs |
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(* direct subclass, cf. 8.1.3 *) |
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subcls1_def: "subcls1 G \<equiv> {(C,D). C\<noteq>Object \<and> (\<exists>c. class G C=Some c \<and> fst c=D)}" |
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lemma subcls1D: |
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"G\<turnstile>C\<prec>C1D \<Longrightarrow> C \<noteq> Object \<and> (\<exists>fs ms. class G C = Some (D,fs,ms))" |
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apply (unfold subcls1_def) |
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apply auto |
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done |
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lemma subcls1I: "\<lbrakk>class G C = Some (D,rest); C \<noteq> Object\<rbrakk> \<Longrightarrow> G\<turnstile>C\<prec>C1D" |
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apply (unfold subcls1_def) |
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apply auto |
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done |
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lemma subcls1_def2: |
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"subcls1 G = (\<Sigma>C\<in>{C. is_class G C} . {D. C\<noteq>Object \<and> fst (the (class G C))=D})" |
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apply (unfold subcls1_def is_class_def) |
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apply auto |
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done |
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lemma finite_subcls1: "finite (subcls1 G)" |
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apply(subst subcls1_def2) |
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apply(rule finite_SigmaI [OF finite_is_class]) |
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apply(rule_tac B = "{fst (the (class G C))}" in finite_subset) |
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apply auto |
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done |
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lemma subcls_is_class: "(C,D) \<in> (subcls1 G)^+ ==> is_class G C" |
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apply (unfold is_class_def) |
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apply(erule trancl_trans_induct) |
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apply (auto dest!: subcls1D) |
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done |
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lemma subcls_is_class2 [rule_format (no_asm)]: |
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"G\<turnstile>C\<preceq>C D \<Longrightarrow> is_class G D \<longrightarrow> is_class G C" |
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apply (unfold is_class_def) |
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apply (erule rtrancl_induct) |
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apply (drule_tac [2] subcls1D) |
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apply auto |
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done |
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declare same_fstI [intro!] (*### TO HOL/Wellfounded_Relations *) |
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consts class_rec ::"'c prog \<times> cname \<Rightarrow> |
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'a \<Rightarrow> (cname \<Rightarrow> fdecl list \<Rightarrow> 'c mdecl list \<Rightarrow> 'a \<Rightarrow> 'a) \<Rightarrow> 'a" |
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recdef class_rec "same_fst (\<lambda>G. wf ((subcls1 G)^-1)) (\<lambda>G. (subcls1 G)^-1)" |
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"class_rec (G,C) = (\<lambda>t f. case class G C of None \<Rightarrow> arbitrary |
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| Some (D,fs,ms) \<Rightarrow> if wf ((subcls1 G)^-1) then |
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f C fs ms (if C = Object then t else class_rec (G,D) t f) else arbitrary)" |
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(hints intro: subcls1I) |
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declare class_rec.simps [simp del] |
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lemma class_rec_lemma: "\<lbrakk> wf ((subcls1 G)^-1); class G C = Some (D,fs,ms)\<rbrakk> \<Longrightarrow> |
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class_rec (G,C) t f = f C fs ms (if C=Object then t else class_rec (G,D) t f)"; |
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apply (rule class_rec.simps [THEN trans [THEN fun_cong [THEN fun_cong]]]) |
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apply simp |
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done |
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consts |
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method :: "'c prog \<times> cname => ( sig \<leadsto> cname \<times> ty \<times> 'c)" (* ###curry *) |
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field :: "'c prog \<times> cname => ( vname \<leadsto> cname \<times> ty )" (* ###curry *) |
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fields :: "'c prog \<times> cname => ((vname \<times> cname) \<times> ty) list" (* ###curry *) |
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(* methods of a class, with inheritance, overriding and hiding, cf. 8.4.6 *) |
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defs method_def: "method \<equiv> \<lambda>(G,C). class_rec (G,C) empty (\<lambda>C fs ms ts. |
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ts ++ map_of (map (\<lambda>(s,m). (s,(C,m))) ms))" |
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lemma method_rec_lemma: "[|class G C = Some (D,fs,ms); wf ((subcls1 G)^-1)|] ==> |
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method (G,C) = (if C = Object then empty else method (G,D)) ++ |
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map_of (map (\<lambda>(s,m). (s,(C,m))) ms)" |
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apply (unfold method_def) |
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apply (simp split del: split_if) |
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apply (erule (1) class_rec_lemma [THEN trans]); |
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apply auto |
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done |
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(* list of fields of a class, including inherited and hidden ones *) |
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defs fields_def: "fields \<equiv> \<lambda>(G,C). class_rec (G,C) [] (\<lambda>C fs ms ts. |
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map (\<lambda>(fn,ft). ((fn,C),ft)) fs @ ts)" |
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lemma fields_rec_lemma: "[|class G C = Some (D,fs,ms); wf ((subcls1 G)^-1)|] ==> |
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fields (G,C) = |
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map (\<lambda>(fn,ft). ((fn,C),ft)) fs @ (if C = Object then [] else fields (G,D))" |
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apply (unfold fields_def) |
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apply (simp split del: split_if) |
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apply (erule (1) class_rec_lemma [THEN trans]); |
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apply auto |
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done |
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defs field_def: "field == map_of o (map (\<lambda>((fn,fd),ft). (fn,(fd,ft)))) o fields" |
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lemma field_fields: |
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"field (G,C) fn = Some (fd, fT) \<Longrightarrow> map_of (fields (G,C)) (fn, fd) = Some fT" |
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apply (unfold field_def) |
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apply (rule table_of_remap_SomeD) |
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apply simp |
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done |
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inductive "widen G" intros (*widening, viz. method invocation conversion,cf. 5.3 |
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i.e. sort of syntactic subtyping *) |
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refl [intro!, simp]: "G\<turnstile> T \<preceq> T" (* identity conv., cf. 5.1.1 *) |
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subcls : "G\<turnstile>C\<preceq>C D ==> G\<turnstile>Class C \<preceq> Class D" |
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143 |
null [intro!]: "G\<turnstile> NT \<preceq> RefT R" |
8011 | 144 |
|
11026
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145 |
inductive "cast G" intros (* casting conversion, cf. 5.5 / 5.1.5 *) |
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146 |
(* left out casts on primitve types *) |
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147 |
widen: "G\<turnstile>C\<preceq>C D ==> G\<turnstile>C \<preceq>? D" |
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148 |
subcls: "G\<turnstile>D\<preceq>C C ==> G\<turnstile>C \<preceq>? D" |
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|
149 |
|
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150 |
lemma widen_PrimT_RefT [iff]: "(G\<turnstile>PrimT pT\<preceq>RefT rT) = False" |
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151 |
apply (rule iffI) |
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152 |
apply (erule widen.elims) |
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|
153 |
apply auto |
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|
154 |
done |
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|
155 |
|
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156 |
lemma widen_RefT: "G\<turnstile>RefT R\<preceq>T ==> \<exists>t. T=RefT t" |
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157 |
apply (ind_cases "G\<turnstile>S\<preceq>T") |
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|
158 |
apply auto |
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|
159 |
done |
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|
160 |
|
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|
161 |
lemma widen_RefT2: "G\<turnstile>S\<preceq>RefT R ==> \<exists>t. S=RefT t" |
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162 |
apply (ind_cases "G\<turnstile>S\<preceq>T") |
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|
163 |
apply auto |
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164 |
done |
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|
165 |
|
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166 |
lemma widen_Class: "G\<turnstile>Class C\<preceq>T ==> \<exists>D. T=Class D" |
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167 |
apply (ind_cases "G\<turnstile>S\<preceq>T") |
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168 |
apply auto |
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169 |
done |
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|
170 |
|
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171 |
lemma widen_Class_NullT [iff]: "(G\<turnstile>Class C\<preceq>NT) = False" |
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172 |
apply (rule iffI) |
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173 |
apply (ind_cases "G\<turnstile>S\<preceq>T") |
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174 |
apply auto |
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|
175 |
done |
8011 | 176 |
|
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177 |
lemma widen_Class_Class [iff]: "(G\<turnstile>Class C\<preceq> Class D) = (G\<turnstile>C\<preceq>C D)" |
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178 |
apply (rule iffI) |
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179 |
apply (ind_cases "G\<turnstile>S\<preceq>T") |
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180 |
apply (auto elim: widen.subcls) |
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181 |
done |
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|
182 |
|
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183 |
lemma widen_trans [rule_format (no_asm)]: "G\<turnstile>S\<preceq>U ==> \<forall>T. G\<turnstile>U\<preceq>T --> G\<turnstile>S\<preceq>T" |
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184 |
apply (erule widen.induct) |
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185 |
apply safe |
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186 |
apply (frule widen_Class) |
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187 |
apply (frule_tac [2] widen_RefT) |
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188 |
apply safe |
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189 |
apply(erule (1) rtrancl_trans) |
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190 |
done |
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|
191 |
|
8011 | 192 |
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193 |
(*####theorem widen_trans: "\<lbrakk>G\<turnstile>S\<preceq>U; G\<turnstile>U\<preceq>T\<rbrakk> \<Longrightarrow> G\<turnstile>S\<preceq>T" |
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194 |
proof - |
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195 |
assume "G\<turnstile>S\<preceq>U" |
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196 |
thus "\<And>T. G\<turnstile>U\<preceq>T \<Longrightarrow> G\<turnstile>S\<preceq>T" (*(is "PROP ?P S U")*) |
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197 |
proof (induct (*cases*) (open) (*?P S U*) rule: widen.induct [consumes 1]) |
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|
198 |
case refl |
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199 |
fix T' assume "G\<turnstile>T\<preceq>T'" thus "G\<turnstile>T\<preceq>T'". |
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|
200 |
(* fix T' show "PROP ?P T T".*) |
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201 |
next |
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202 |
case subcls |
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203 |
fix T assume "G\<turnstile>Class D\<preceq>T" |
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204 |
then obtain E where "T = Class E" by (blast dest: widen_Class) |
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205 |
from prems show "G\<turnstile>Class C\<preceq>T" proof (auto elim: rtrancl_trans) qed |
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|
206 |
next |
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|
207 |
case null |
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208 |
fix RT assume "G\<turnstile>RefT R\<preceq>RT" |
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209 |
then obtain rt where "RT = RefT rt" by (blast dest: widen_RefT) |
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210 |
thus "G\<turnstile>NT\<preceq>RT" by auto |
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|
211 |
qed |
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|
212 |
qed |
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|
213 |
*) |
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|
214 |
|
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|
215 |
theorem widen_trans: "\<lbrakk>G\<turnstile>S\<preceq>U; G\<turnstile>U\<preceq>T\<rbrakk> \<Longrightarrow> G\<turnstile>S\<preceq>T" |
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|
216 |
proof - |
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|
217 |
assume "G\<turnstile>S\<preceq>U" |
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|
218 |
thus "\<And>T. G\<turnstile>U\<preceq>T \<Longrightarrow> G\<turnstile>S\<preceq>T" (*(is "PROP ?P S U")*) |
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|
219 |
proof (induct (*cases*) (open) (*?P S U*)) (* rule: widen.induct *) |
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|
220 |
case refl |
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|
221 |
fix T' assume "G\<turnstile>T\<preceq>T'" thus "G\<turnstile>T\<preceq>T'". |
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|
222 |
(* fix T' show "PROP ?P T T".*) |
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|
223 |
next |
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|
224 |
case subcls |
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|
225 |
fix T assume "G\<turnstile>Class D\<preceq>T" |
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|
226 |
then obtain E where "T = Class E" by (blast dest: widen_Class) |
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|
227 |
from prems show "G\<turnstile>Class C\<preceq>T" proof (auto elim: rtrancl_trans) qed |
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|
228 |
next |
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|
229 |
case null |
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|
230 |
fix RT assume "G\<turnstile>RefT R\<preceq>RT" |
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|
231 |
then obtain rt where "RT = RefT rt" by (blast dest: widen_RefT) |
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|
232 |
thus "G\<turnstile>NT\<preceq>RT" by auto |
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|
233 |
qed |
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|
234 |
qed |
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|
235 |
|
a50365d21144
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|
236 |
|
8011 | 237 |
|
238 |
end |