--- a/src/HOL/Library/List_Cset.thy Thu Jun 09 00:16:28 2011 +0200 +++ b/src/HOL/Library/List_Cset.thy Thu Jun 09 08:31:41 2011 +0200 @@ -219,4 +219,6 @@ by (auto simp add: coset_def) qed +declare mem_def[simp del] + end \ No newline at end of file