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src/HOL/Semiring_Normalization.thy
changeset 54230 b1d955791529
parent 53076 47c9aff07725
child 57514 bdc2c6b40bf2 
--- a/src/HOL/Semiring_Normalization.thy	Thu Oct 31 16:54:22 2013 +0100
+++ b/src/HOL/Semiring_Normalization.thy	Fri Nov 01 18:51:14 2013 +0100
@@ -137,7 +137,7 @@
 lemma normalizing_ring_rules:
   "- x = (- 1) * x"
   "x - y = x + (- y)"
-  by (simp_all add: diff_minus)
+  by simp_all
 
 lemmas normalizing_comm_ring_1_axioms =
   comm_ring_1_axioms [normalizer
isabelle