diff -r 42dac1cfcd14 -r 55b156ac4a40 LamEx.thy
--- a/LamEx.thy	Fri Oct 30 15:30:33 2009 +0100
+++ b/LamEx.thy	Fri Oct 30 15:32:04 2009 +0100
@@ -109,7 +109,7 @@
 sorry 
 
 lemma real_alpha:
-  assumes "t = ([(a,b)]\<bullet>s)" "a\<sharp>[b].s"
+  assumes "t = [(a,b)]\<bullet>s" "a\<sharp>[b].s"
   shows "Lam a t = Lam b s"
 sorry