1.1 --- a/src/HOL/Set.thy	Tue Mar 31 12:07:17 2009 +0200
     1.2 +++ b/src/HOL/Set.thy	Tue Mar 31 13:23:39 2009 +0200
     1.3 @@ -2384,7 +2384,7 @@
     1.4    unfolding Inf_bool_def by auto
     1.5  
     1.6  lemma not_Sup_empty_bool [simp]:
     1.7 -  "\<not> Sup {}"
     1.8 +  "\<not> \<Squnion>{}"
     1.9    unfolding Sup_bool_def by auto
    1.10  
    1.11