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src/HOL/ZF/HOLZF.thy
changeset 57492 74bf65a1910a
parent 56073 29e308b56d23
child 61076 bdc1e2f0a86a 
--- a/src/HOL/ZF/HOLZF.thy	Wed Jul 02 17:34:45 2014 +0200
+++ b/src/HOL/ZF/HOLZF.thy	Wed Jun 11 14:24:23 2014 +1000
@@ -168,7 +168,7 @@
 
 theorem Domain: "Elem x (Domain f) = (? y. Elem (Opair x y) f)"
   apply (auto simp add: Domain_def Replacement)
-  apply (rule_tac x="Snd x" in exI)
+  apply (rule_tac x="Snd xa" in exI)
   apply (simp add: FstSnd)
   apply (rule_tac x="Opair x y" in exI)
   apply (simp add: isOpair Fst)
isabelle