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diff --git a/helm/software/matita/contribs/RELATIONAL/ZEq/defs.ma b/helm/software/matita/contribs/RELATIONAL/ZEq/defs.ma
deleted file mode 100644
index 0fa85f7f0..000000000
--- a/helm/software/matita/contribs/RELATIONAL/ZEq/defs.ma
+++ /dev/null
@@ -1,26 +0,0 @@
-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-
-
-include "datatypes/Zah.ma".
-include "NPlus/defs.ma".
-
-inductive ZEq: Zah → Zah → Prop :=
-   | zeq: ∀m1,m2,m3,m4,n. m1 ⊕ m4 ≍ n → m3 ⊕ m2 ≍ n →
-          ZEq 〈m1,m2〉 〈m3, m4〉
-.
-
-interpretation "integer equality" 'napart x y = (ZEq x y).
-