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src/HOL/Presburger.thy
changeset 28967 3bdb1eae352c
parent 28402 09e4aa3ddc25
child 29667 53103fc8ffa3 
--- a/src/HOL/Presburger.thy	Wed Dec 03 21:00:39 2008 -0800
+++ b/src/HOL/Presburger.thy	Wed Dec 03 21:50:36 2008 -0800
@@ -411,7 +411,7 @@
   by (simp cong: conj_cong)
 lemma int_eq_number_of_eq:
   "(((number_of v)::int) = (number_of w)) = iszero ((number_of (v + (uminus w)))::int)"
-  by simp
+  by (rule eq_number_of_eq)
 
 lemma mod_eq0_dvd_iff[presburger]: "(m::nat) mod n = 0 \<longleftrightarrow> n dvd m"
 unfolding dvd_eq_mod_eq_0[symmetric] ..
isabelle