1.1 --- a/doc-src/ZF/ZF_examples.thy	Fri Jun 17 11:35:35 2005 +0200
     1.2 +++ b/doc-src/ZF/ZF_examples.thy	Fri Jun 17 16:12:49 2005 +0200
     1.3 @@ -1,6 +1,6 @@
     1.4  header{*Examples of Reasoning in ZF Set Theory*}
     1.5  
     1.6 -theory ZF_examples = Main_ZFC:
     1.7 +theory ZF_examples imports Main_ZFC begin
     1.8  
     1.9  subsection {* Binary Trees *}
    1.10