--- a/src/HOL/Isar_Examples/Peirce.thy Sun Nov 02 17:20:45 2014 +0100
+++ b/src/HOL/Isar_Examples/Peirce.thy Sun Nov 02 17:23:48 2014 +0100
@@ -2,7 +2,7 @@
Author: Markus Wenzel, TU Muenchen
*)
-header \<open>Peirce's Law\<close>
+section \<open>Peirce's Law\<close>
theory Peirce
imports Main