--- a/src/HOL/ex/Unification.thy Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/ex/Unification.thy Sun Nov 02 18:21:45 2014 +0100
@@ -4,7 +4,7 @@
Author: Alexander Krauss, TUM
*)
-header {* Substitution and Unification *}
+section {* Substitution and Unification *}
theory Unification
imports Main