--- a/src/HOL/Library/Tree.thy Sun Nov 02 17:16:01 2014 +0100 +++ b/src/HOL/Library/Tree.thy Sun Nov 02 17:20:45 2014 +0100 @@ -1,6 +1,6 @@ (* Author: Tobias Nipkow *) -header {* Binary Tree *} +section {* Binary Tree *} theory Tree imports Main