src/HOL/Cardinals/Cardinals.thy

--- a/src/HOL/Cardinals/Cardinals.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Cardinals/Cardinals.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -6,7 +6,7 @@
 Theory of ordinals and cardinals.
 *)
 
-header {* Theory of Ordinals and Cardinals *}
+section {* Theory of Ordinals and Cardinals *}
 
 theory Cardinals
 imports Ordinal_Arithmetic Cardinal_Arithmetic Wellorder_Extension