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doc-src/AxClass/Group/Semigroups.thy
changeset 16417 9bc16273c2d4
parent 12338 de0f4a63baa5 
--- a/doc-src/AxClass/Group/Semigroups.thy	Fri Jun 17 11:35:35 2005 +0200
+++ b/doc-src/AxClass/Group/Semigroups.thy	Fri Jun 17 16:12:49 2005 +0200
@@ -1,7 +1,7 @@
 
 header {* Semigroups *}
 
-theory Semigroups = Main:
+theory Semigroups imports Main begin
 
 text {*
   \medskip\noindent An axiomatic type class is simply a class of types
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