1.1 --- a/src/HOL/ex/Unification.thy	Sun Nov 02 18:21:14 2014 +0100
     1.2 +++ b/src/HOL/ex/Unification.thy	Sun Nov 02 18:21:45 2014 +0100
     1.3 @@ -4,7 +4,7 @@
     1.4      Author:     Alexander Krauss, TUM
     1.5  *)
     1.6  
     1.7 -header {* Substitution and Unification *}
     1.8 +section {* Substitution and Unification *}
     1.9  
    1.10  theory Unification
    1.11  imports Main