1.1 --- a/src/HOL/Sum_Type.thy	Sun Nov 02 18:21:14 2014 +0100
     1.2 +++ b/src/HOL/Sum_Type.thy	Sun Nov 02 18:21:45 2014 +0100
     1.3 @@ -3,7 +3,7 @@
     1.4      Copyright   1992  University of Cambridge
     1.5  *)
     1.6  
     1.7 -header{*The Disjoint Sum of Two Types*}
     1.8 +section{*The Disjoint Sum of Two Types*}
     1.9  
    1.10  theory Sum_Type
    1.11  imports Typedef Inductive Fun