X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Flibrary%2FZ%2Fz.ma;h=ac530c38fe02b7df1766fd69ff93a637162131b0;hb=ef870606391fff198f215127eb022eb3e41ab1d4;hp=64b608cb9524602afa01054b31624d833f9d8d0c;hpb=040b70279b9bf0f576f00a9b1ad28df3c8bf6024;p=helm.git

diff --git a/matita/library/Z/z.ma b/matita/library/Z/z.ma
index 64b608cb9..ac530c38f 100644
--- a/matita/library/Z/z.ma
+++ b/matita/library/Z/z.ma
@@ -122,7 +122,7 @@ elim x.
   (* goal: x=pos y=pos *)
     elim (decidable_eq_nat n n1:((n=n1) \lor ((n=n1) \to False))).
     left.apply eq_f.assumption.
-    right.unfold Not.intros (H_inj).apply H. destruct H_inj. assumption.
+    right.unfold Not.intros (H_inj).apply H. destruct H_inj. reflexivity.
   (* goal: x=pos y=neg *)
     right.unfold Not.intro.apply (not_eq_pos_neg n n1). assumption.
 (* goal: x=neg *)