src/HOL/Groups.thy

--- a/src/HOL/Groups.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Groups.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -2,7 +2,7 @@
     Author:  Gertrud Bauer, Steven Obua, Lawrence C Paulson, Markus Wenzel, Jeremy Avigad
 *)
 
-header {* Groups, also combined with orderings *}
+section {* Groups, also combined with orderings *}
 
 theory Groups
 imports Orderings