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doc-src/TutorialI/Sets/Functions.thy
changeset 10983 59961d32b1ae
parent 10849 de981d0037ed
child 16417 9bc16273c2d4 
--- a/doc-src/TutorialI/Sets/Functions.thy	Fri Jan 26 15:02:04 2001 +0100
+++ b/doc-src/TutorialI/Sets/Functions.thy	Fri Jan 26 15:50:28 2001 +0100
@@ -79,7 +79,7 @@
 *}
 
 lemma "inj f \<Longrightarrow> (f o g = f o h) = (g = h)";
-  apply (simp add: expand_fun_eq inj_on_def o_def)
+  apply (simp add: expand_fun_eq inj_on_def)
   apply (auto)
   done
isabelle