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diff --git a/helm/software/matita/contribs/RELATIONAL/NPlus/defs.ma b/helm/software/matita/contribs/RELATIONAL/NPlus/defs.ma
deleted file mode 100644
index 15a16b72c..000000000
--- a/helm/software/matita/contribs/RELATIONAL/NPlus/defs.ma
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@@ -1,27 +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/Nat.ma".
-
-inductive NPlus (p:Nat): Nat → Nat → Prop ≝
-   | nplus_zero_2: NPlus p zero p
-   | nplus_succ_2: ∀q, r. NPlus p q r → NPlus p (succ q) (succ r).
-
-interpretation "natural plus predicate" 'rel_plus x y z = (NPlus x y z).
-
-notation "hvbox(a break ⊕ b break ≍ c)"
-  non associative with precedence 45
-for @{'rel_plus $a $b $c}.