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src/HOL/Wellfounded.thy
changeset 39302 d7728f65b353
parent 37767 a2b7a20d6ea3
child 40607 30d512bf47a7 
--- a/src/HOL/Wellfounded.thy	Mon Sep 13 08:43:48 2010 +0200
+++ b/src/HOL/Wellfounded.thy	Mon Sep 13 11:13:15 2010 +0200
@@ -781,7 +781,7 @@
 
           let ?N1 = "{ n \<in> N. (n, a) \<in> r }"
           let ?N2 = "{ n \<in> N. (n, a) \<notin> r }"
-          have N: "?N1 \<union> ?N2 = N" by (rule set_ext) auto
+          have N: "?N1 \<union> ?N2 = N" by (rule set_eqI) auto
           from Nless have "finite N" by (auto elim: max_ext.cases)
           then have finites: "finite ?N1" "finite ?N2" by auto
isabelle