diff -r 940530087f30 -r 6342d0570502 thys/Sulzmann.thy
--- a/thys/Sulzmann.thy	Tue Apr 05 09:27:36 2016 +0100
+++ b/thys/Sulzmann.thy	Tue Apr 05 14:00:55 2016 +0100
@@ -198,9 +198,6 @@
 apply(simp)
 apply(simp)
 apply(erule Prf_elims)
-apply(simp)
-apply(erule Prf_elims)
-apply(simp)
 apply(auto split: prod.splits)[1]
 oops