diff -r b98cd131e2b5 -r 5b5656a63bd6 src/HOL/ex/Normalization_by_Evaluation.thy
--- a/src/HOL/ex/Normalization_by_Evaluation.thy	Tue Oct 06 17:46:07 2015 +0200
+++ b/src/HOL/ex/Normalization_by_Evaluation.thy	Tue Oct 06 17:47:28 2015 +0200
@@ -1,6 +1,6 @@
 (*  Authors:  Klaus Aehlig, Tobias Nipkow *)
 
-section {* Testing implementation of normalization by evaluation *}
+section \<open>Testing implementation of normalization by evaluation\<close>
 
 theory Normalization_by_Evaluation
 imports Complex_Main