diff -r 68ccf847507d -r 028d5511c15f Nominal/Nominal2_Eqvt.thy
--- a/Nominal/Nominal2_Eqvt.thy	Tue Jan 18 19:27:30 2011 +0100
+++ b/Nominal/Nominal2_Eqvt.thy	Tue Jan 18 21:26:58 2011 +0100
@@ -33,7 +33,8 @@
   swap_eqvt flip_eqvt
 
   (* datatypes *)
-  Pair_eqvt permute_list.simps permute_option.simps
+  Pair_eqvt permute_list.simps permute_option.simps 
+  permute_sum.simps
 
   (* sets *)
   mem_eqvt empty_eqvt insert_eqvt set_eqvt inter_eqvt