--- a/src/HOL/Infinite_Set.thy Fri May 21 21:14:18 2004 +0200
+++ b/src/HOL/Infinite_Set.thy Fri May 21 21:14:52 2004 +0200
@@ -245,8 +245,8 @@
assumes inf: "infinite (S::'a set)"
shows "\<exists>f. inj (f::nat \<Rightarrow> 'a) \<and> range f \<subseteq> S"
proof -
- def Sseq \<equiv> "nat_rec S (\<lambda>n T. T - {\<epsilon> e. e \<in> T})"
- def pick \<equiv> "\<lambda>n. (\<epsilon> e. e \<in> Sseq n)"
+ def Sseq \<equiv> "nat_rec S (\<lambda>n T. T - {SOME e. e \<in> T})"
+ def pick \<equiv> "\<lambda>n. (SOME e. e \<in> Sseq n)"
have Sseq_inf: "\<And>n. infinite (Sseq n)"
proof -
fix n