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diff --git a/matita/contribs/RELATIONAL/NPlusList/props.ma b/matita/contribs/RELATIONAL/NPlusList/props.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 "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