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src/ZF/Induct/PropLog.thy
changeset 76217 8655344f1cf6
parent 76216 9fc34f76b4e8
child 76219 cf7db6353322 
--- a/src/ZF/Induct/PropLog.thy	Tue Sep 27 17:54:20 2022 +0100
+++ b/src/ZF/Induct/PropLog.thy	Tue Sep 27 18:02:34 2022 +0100
@@ -107,7 +107,7 @@
 subsection \<open>Proof theory of propositional logic\<close>
 
 lemma thms_mono: "G \<subseteq> H \<Longrightarrow> thms(G) \<subseteq> thms(H)"
-  apply (unfold thms.defs)
+    unfolding thms.defs
   apply (rule lfp_mono)
     apply (rule thms.bnd_mono)+
   apply (assumption | rule univ_mono basic_monos)+
isabelle