--- a/src/HOL/Library/Boolean_Algebra.thy Thu Jun 26 10:06:54 2008 +0200
+++ b/src/HOL/Library/Boolean_Algebra.thy Thu Jun 26 10:07:01 2008 +0200
@@ -8,7 +8,7 @@
header {* Boolean Algebras *}
theory Boolean_Algebra
-imports ATP_Linkup
+imports Plain
begin
locale boolean =