src/HOL/IMP/Def_Ass_Sound_Small.thy
 changeset 45015 fdac1e9880eb parent 44890 22f665a2e91c child 47818 151d137f1095
```--- a/src/HOL/IMP/Def_Ass_Sound_Small.thy	Tue Sep 20 05:47:11 2011 +0200
+++ b/src/HOL/IMP/Def_Ass_Sound_Small.thy	Tue Sep 20 05:48:23 2011 +0200
@@ -7,7 +7,7 @@

theorem progress:
"D (dom s) c A' \<Longrightarrow> c \<noteq> SKIP \<Longrightarrow> EX cs'. (c,s) \<rightarrow> cs'"
-proof (induct c arbitrary: s A')
+proof (induction c arbitrary: s A')
case Assign thus ?case by auto (metis aval_Some small_step.Assign)
next
case (If b c1 c2)
@@ -17,13 +17,13 @@
qed (fastforce intro: small_step.intros)+

lemma D_mono:  "D A c M \<Longrightarrow> A \<subseteq> A' \<Longrightarrow> EX M'. D A' c M' & M <= M'"
-proof (induct c arbitrary: A A' M)
+proof (induction c arbitrary: A A' M)
case Semi thus ?case by auto (metis D.intros(3))
next
case (If b c1 c2)
then obtain M1 M2 where "vars b \<subseteq> A" "D A c1 M1" "D A c2 M2" "M = M1 \<inter> M2"
by auto
-  with If.hyps `A \<subseteq> A'` obtain M1' M2'
+  with If.IH `A \<subseteq> A'` obtain M1' M2'
where "D A' c1 M1'" "D A' c2 M2'" and "M1 \<subseteq> M1'" "M2 \<subseteq> M2'" by metis
hence "D A' (IF b THEN c1 ELSE c2) (M1' \<inter> M2')" and "M \<subseteq> M1' \<inter> M2'"
using `vars b \<subseteq> A` `A \<subseteq> A'` `M = M1 \<inter> M2` by(fastforce intro: D.intros)+
@@ -34,7 +34,7 @@

theorem D_preservation:
"(c,s) \<rightarrow> (c',s') \<Longrightarrow> D (dom s) c A \<Longrightarrow> EX A'. D (dom s') c' A' & A <= A'"
-proof (induct arbitrary: A rule: small_step_induct)
+proof (induction arbitrary: A rule: small_step_induct)
case (While b c s)
then obtain A' where "vars b \<subseteq> dom s" "A = dom s" "D (dom s) c A'" by blast
moreover
@@ -49,7 +49,7 @@
theorem D_sound:
"(c,s) \<rightarrow>* (c',s') \<Longrightarrow> D (dom s) c A' \<Longrightarrow> c' \<noteq> SKIP
\<Longrightarrow> \<exists>cs''. (c',s') \<rightarrow> cs''"
-apply(induct arbitrary: A' rule:star_induct)
+apply(induction arbitrary: A' rule:star_induct)
apply (metis progress)
by (metis D_preservation)
```