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diff --git a/helm/matita/tests/test3.ma b/helm/matita/tests/test3.ma
index c4aafaf3c..98dc65c95 100644
--- a/helm/matita/tests/test3.ma
+++ b/helm/matita/tests/test3.ma
@@ -1,8 +1,31 @@
-alias symbol "eq" (instance 0) = "leibnitz's equality".
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+set "baseuri" "cic:/matita/tests/test3/".
+include "coq.ma".
+
+alias symbol "eq" (instance 0) = "Coq's leibnitz's equality".
 theorem a:\forall x.x=x.
 alias id "nat" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1)".
-goal 5.
-exact nat.
+[ exact nat.
+| intro. reflexivity.
+]
+qed.
+alias num (instance 0) = "natural number".
+alias symbol "times" (instance 0) = "Coq's natural times".
+
+theorem b:\forall p:nat. p * 0=0.
 intro.
-reflexivity.
-qed.
\ No newline at end of file
+auto.
+qed.