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src/HOL/Library/Permutation.thy
changeset 60495 d7ff0a1df90a
parent 60397 f8a513fedb31
child 60502 aa58872267ee 
--- a/src/HOL/Library/Permutation.thy	Tue Jun 16 20:50:00 2015 +0100
+++ b/src/HOL/Library/Permutation.thy	Wed Jun 17 17:21:11 2015 +0200
@@ -136,7 +136,7 @@
   apply (erule perm.trans)
   apply (rule perm_sym)
   apply (erule perm_remove)
-  apply (drule_tac f=set_of in arg_cong)
+  apply (drule_tac f=set_mset in arg_cong)
   apply simp
   done
isabelle