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src/ZF/AC/AC7_AC9.thy
changeset 76216 9fc34f76b4e8
parent 76215 a642599ffdea
child 76217 8655344f1cf6 
--- a/src/ZF/AC/AC7_AC9.thy	Tue Sep 27 17:46:52 2022 +0100
+++ b/src/ZF/AC/AC7_AC9.thy	Tue Sep 27 17:54:20 2022 +0100
@@ -22,7 +22,7 @@
         "C \<in> A \<Longrightarrow> (\<lambda>g \<in> (nat->\<Union>(A))*C.   
                 (\<lambda>n \<in> nat. if(n=0, snd(g), fst(g)`(n #- 1))))   
                 \<in> inj((nat->\<Union>(A))*C, (nat->\<Union>(A)) ) "
-apply (unfold inj_def)
+  unfolding inj_def
 apply (rule CollectI)
 apply (fast intro!: lam_type if_type apply_type fst_type snd_type, auto) 
 apply (rule fun_extension, assumption+)
isabelle