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src/HOL/Orderings.thy
changeset 28823 dcbef866c9e2
parent 28685 275122631271
child 29580 117b88da143c 
--- a/src/HOL/Orderings.thy	Mon Nov 17 17:00:27 2008 +0100
+++ b/src/HOL/Orderings.thy	Mon Nov 17 17:00:55 2008 +0100
@@ -71,7 +71,7 @@
 
 lemma dual_preorder:
   "preorder (op \<ge>) (op >)"
-by unfold_locales (auto simp add: less_le_not_le intro: order_trans)
+proof qed (auto simp add: less_le_not_le intro: order_trans)
 
 end
isabelle