diff -r 6061ae1f90f2 -r 9bc16273c2d4 doc-src/ZF/ZF_examples.thy
--- a/doc-src/ZF/ZF_examples.thy	Fri Jun 17 11:35:35 2005 +0200
+++ b/doc-src/ZF/ZF_examples.thy	Fri Jun 17 16:12:49 2005 +0200
@@ -1,6 +1,6 @@
 header{*Examples of Reasoning in ZF Set Theory*}
 
-theory ZF_examples = Main_ZFC:
+theory ZF_examples imports Main_ZFC begin
 
 subsection {* Binary Trees *}