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diff --git a/helm/software/matita/contribs/RELATIONAL/NPlusList/defs.ma b/helm/software/matita/contribs/RELATIONAL/NPlusList/defs.ma
deleted file mode 100644
index cac07f91a..000000000
--- a/helm/software/matita/contribs/RELATIONAL/NPlusList/defs.ma
+++ /dev/null
@@ -1,38 +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/List.ma".
-include "NPlus/defs.ma".
-
-
-inductive NPlusList: (List Nat) \to Nat \to Prop \def
-   | nplus_nil: NPlusList (nil ?) zero  
-   | nplus_cons: \forall l,p,q,r. 
-                 NPlusList l p \to NPlus p q r \to NPlusList (cons ? l q) r
-.
-
-definition NPlusListEq: (List Nat) \to (List Nat) \to Prop \def
-   \lambda ns1,ns2. \exists n. NPlusList ns1 n \land NPlusList ns2 n.
-
-(*
-(*CSC: the URI must disappear: there is a bug now *)
-interpretation "ternary natural plus predicate" 'rel_plus3 x y z = 
-   (cic:/matita/RELATIONAL/NPlus/defs/NPlus3.con w x y z).
-
-notation "hvbox(a break + b break + c == d)" 
-  non associative with precedence 95
-for @{ 'rel_plus3 $a $b $c $d}.
-*)