diff -r e1bd8a54c40f -r d7728f65b353 src/HOL/Big_Operators.thy
--- a/src/HOL/Big_Operators.thy	Mon Sep 13 08:43:48 2010 +0200
+++ b/src/HOL/Big_Operators.thy	Mon Sep 13 11:13:15 2010 +0200
@@ -1504,11 +1504,11 @@
 
 lemma dual_max:
   "ord.max (op \<ge>) = min"
-  by (auto simp add: ord.max_def_raw min_def ext_iff)
+  by (auto simp add: ord.max_def_raw min_def fun_eq_iff)
 
 lemma dual_min:
   "ord.min (op \<ge>) = max"
-  by (auto simp add: ord.min_def_raw max_def ext_iff)
+  by (auto simp add: ord.min_def_raw max_def fun_eq_iff)
 
 lemma strict_below_fold1_iff:
   assumes "finite A" and "A \<noteq> {}"