src/HOL/ex/PER.thy

--- a/src/HOL/ex/PER.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/ex/PER.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -2,7 +2,7 @@
     Author:     Oscar Slotosch and Markus Wenzel, TU Muenchen
 *)
 
-header {* Partial equivalence relations *}
+section {* Partial equivalence relations *}
 
 theory PER imports Main begin