--- 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 *}