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src/HOL/Algebra/abstract/Ring2.thy
changeset 22384 33a46e6c7f04
parent 21588 cd0dc678a205
child 22808 a7daa74e2980 
--- a/src/HOL/Algebra/abstract/Ring2.thy	Fri Mar 02 12:38:58 2007 +0100
+++ b/src/HOL/Algebra/abstract/Ring2.thy	Fri Mar 02 15:43:15 2007 +0100
@@ -256,7 +256,7 @@
 proof (induct n)
   case 0 show ?case by simp
 next
-  case Suc thus ?case by (simp add: semigroup_add_class.add_assoc) 
+  case Suc thus ?case by (simp add: add_assoc) 
 qed
 
 lemma natsum_cong [cong]:
isabelle