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src/ZF/Induct/ListN.thy
changeset 76217 8655344f1cf6
parent 76215 a642599ffdea
child 76987 4c275405faae 
--- a/src/ZF/Induct/ListN.thy	Tue Sep 27 17:54:20 2022 +0100
+++ b/src/ZF/Induct/ListN.thy	Tue Sep 27 18:02:34 2022 +0100
@@ -37,7 +37,7 @@
   done
 
 lemma listn_mono: "A \<subseteq> B \<Longrightarrow> listn(A) \<subseteq> listn(B)"
-  apply (unfold listn.defs)
+    unfolding listn.defs
   apply (rule lfp_mono)
     apply (rule listn.bnd_mono)+
   apply (assumption | rule univ_mono Sigma_mono list_mono basic_monos)+
isabelle