--- a/src/HOL/ex/PER.thy Fri Jun 17 11:35:35 2005 +0200
+++ b/src/HOL/ex/PER.thy Fri Jun 17 16:12:49 2005 +0200
@@ -5,7 +5,7 @@
header {* Partial equivalence relations *}
-theory PER = Main:
+theory PER imports Main begin
text {*
Higher-order quotients are defined over partial equivalence