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src/HOL/Library/List_Set.thy
changeset 31846 89c37daebfdd
parent 31807 039893a9a77d
child 31851 c04f8c51d0ab 
--- a/src/HOL/Library/List_Set.thy	Sat Jun 27 22:28:07 2009 +0200
+++ b/src/HOL/Library/List_Set.thy	Sun Jun 28 10:33:36 2009 +0200
@@ -70,7 +70,7 @@
   by (auto simp add: remove_def remove_all_def)
 
 lemma image_set:
-  "image f (set xs) = set (remdups (map f xs))"
+  "image f (set xs) = set (map f xs)"
   by simp
 
 lemma project_set:
isabelle