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src/HOL/NumberTheory/EulerFermat.thy
changeset 30042 31039ee583fa
parent 27556 292098f2efdf 
--- a/src/HOL/NumberTheory/EulerFermat.thy	Sat Feb 21 09:58:45 2009 +0100
+++ b/src/HOL/NumberTheory/EulerFermat.thy	Sat Feb 21 20:52:30 2009 +0100
@@ -155,7 +155,7 @@
     prefer 2
     apply (subst zdvd_iff_zgcd [symmetric])
      apply (rule_tac [4] zgcd_zcong_zgcd)
-       apply (simp_all add: zdvd_zminus_iff zcong_sym)
+       apply (simp_all add: zcong_sym)
   done
isabelle