--- a/Tutorial/Tutorial1.thy	Tue Mar 22 12:18:30 2016 +0000
+++ b/Tutorial/Tutorial1.thy	Thu Apr 19 13:57:17 2018 +0100
@@ -1,4 +1,4 @@
-header {* 
+(* 
 
   Nominal Isabelle Tutorial at POPL'11
   ====================================
@@ -58,7 +58,7 @@
 
         \<sharp>    sharp     (freshness)
         \<bullet>    bullet    (permutation application)
-*}
+*)
 
 
 theory Tutorial1