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diff --git a/helm/software/matita/contribs/RELATIONAL/NPlusList/props.ma b/helm/software/matita/contribs/RELATIONAL/NPlusList/props.ma
deleted file mode 100644
index 4b70088a2..000000000
--- a/helm/software/matita/contribs/RELATIONAL/NPlusList/props.ma
+++ /dev/null
@@ -1,34 +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 "NPlusList/defs.ma".
-(*
-axiom npluslist_gen_cons: \forall l,q,r. 
-                            NPlusList (cons ? l q) r \to
-                            \exists p. NPlusList l p \land NPlus p q r.
-(* 
- intros. inversion H; clear H; intros;
- [ id
- | destruct.
-*)
-
-theorem npluslist_inj_2: \forall ns1,ns2,n. 
-                         NPlusListEq (cons ? ns1 n) (cons ? ns2 n) \to
-                         NPlusListEq ns1 ns2.
- unfold NPlusListEq. intros. decompose.
- lapply linear npluslist_gen_cons to H. decompose.
- lapply linear npluslist_gen_cons to H2. decompose.
-*)
\ No newline at end of file