diff -r 66823a0066db -r d5b5c9259afd src/HOL/Old_Number_Theory/Legacy_GCD.thy
--- a/src/HOL/Old_Number_Theory/Legacy_GCD.thy	Tue Oct 25 16:37:11 2011 +0200
+++ b/src/HOL/Old_Number_Theory/Legacy_GCD.thy	Thu Oct 27 07:46:57 2011 +0200
@@ -134,7 +134,7 @@
   apply (induct m n rule: gcd_induct)
    apply simp
   apply (case_tac "k = 0")
-   apply (simp_all add: mod_geq gcd_non_0 mod_mult_distrib2)
+   apply (simp_all add: gcd_non_0)
   done
 
 lemma gcd_mult [simp, algebra]: "gcd k (k * n) = k"