--- a/src/HOL/Library/BigO.thy Thu Jun 26 10:06:54 2008 +0200
+++ b/src/HOL/Library/BigO.thy Thu Jun 26 10:07:01 2008 +0200
@@ -6,7 +6,7 @@
header {* Big O notation *}
theory BigO
-imports Main SetsAndFunctions
+imports Plain Presburger SetsAndFunctions
begin
text {*