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diff --git a/matita/contribs/RELATIONAL/NPlus/defs.ma b/matita/contribs/RELATIONAL/NPlus/defs.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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+
+
+include "datatypes/Nat.ma".
+
+inductive NPlus (p:Nat): Nat \to Nat \to Prop \def
+   | nplus_zero_2: NPlus p zero p
+   | nplus_succ_2: \forall q, r. NPlus p q r \to NPlus p (succ q) (succ r).
+
+(*CSC: the URI must disappear: there is a bug now *)
+interpretation "natural plus predicate" 'rel_plus x y z = 
+   (cic:/matita/RELATIONAL/NPlus/defs/NPlus.ind#xpointer(1/1) x y z).
+
+notation "hvbox(a break + b break == c)"
+  non associative with precedence 95
+for @{ 'rel_plus $a $b $c}.