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diff --git a/helm/software/matita/tests/coercions_dupelim.ma b/helm/software/matita/tests/coercions_dupelim.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/test/".
+
+include "nat/nat.ma".
+
+axiom A : Type.
+
+inductive vec : nat -> Type := 
+ | vnil : vec O
+ | vcons : ∀x:A.∀n:nat. vec n -> vec (S n).
+
+definition f := λx,n.λv:vec n.vcons x n v.
+definition g := λn,x.λv:vec n.vcons x n v.
+
+include "logic/equality.ma".
+
+(* definition xx :=  f = g. *)
+theorem xx1 : ∀n.∀x1:vec n.f ? ? x1 = g ? ? x1.