--- a/src/HOL/IMP/Big_Step.thy Tue Nov 14 13:56:38 2017 +0100
+++ b/src/HOL/IMP/Big_Step.thy Tue Nov 14 16:17:08 2017 +0100
@@ -206,13 +206,11 @@
thus ?thesis using `\<not>bval b s` by blast
next
case IfTrue
- with `(?iw, s) \<Rightarrow> t` have "(c;; ?w, s) \<Rightarrow> t" by auto
-- "and for this, only the Seq-rule is applicable:"
- then obtain s' where
+ from `(c;; ?w, s) \<Rightarrow> t` obtain s' where
"(c, s) \<Rightarrow> s'" and "(?w, s') \<Rightarrow> t" by auto
- -- "with this information, we can build a derivation tree for the @{text WHILE}"
- with `bval b s`
- show ?thesis by (rule WhileTrue)
+ -- "with this information, we can build a derivation tree for @{text WHILE}"
+ with `bval b s` show ?thesis by (rule WhileTrue)
qed
qed
ultimately