src/ZF/Induct/Acc.thy

--- a/src/ZF/Induct/Acc.thy	Sun Nov 02 16:09:35 2014 +0100
+++ b/src/ZF/Induct/Acc.thy	Sun Nov 02 16:39:54 2014 +0100
@@ -3,7 +3,7 @@
     Copyright   1994  University of Cambridge
 *)
 
-header {* The accessible part of a relation *}
+section {* The accessible part of a relation *}
 
 theory Acc imports Main begin