diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/HOL/Datatype_Examples/TreeFsetI.thy
--- a/src/HOL/Datatype_Examples/TreeFsetI.thy Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Datatype_Examples/TreeFsetI.thy Sun Nov 02 18:21:45 2014 +0100
@@ -6,7 +6,7 @@
Finitely branching possibly infinite trees, with sets of children.
*)
-header {* Finitely Branching Possibly Infinite Trees, with Sets of Children *}
+section {* Finitely Branching Possibly Infinite Trees, with Sets of Children *}
theory TreeFsetI
imports "~~/src/HOL/Library/FSet"