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diff --git a/matita/contribs/CoRN-Decl/model/structures/Npossec.ma b/matita/contribs/CoRN-Decl/model/structures/Npossec.ma
new file mode 100644
index 000000000..7a47323f6
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+++ b/matita/contribs/CoRN-Decl/model/structures/Npossec.ma
@@ -0,0 +1,37 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* This file was automatically generated: do not edit *********************)
+
+set "baseuri" "cic:/matita/CoRN-Decl/model/structures/Npossec".
+
+include "CoRN.ma".
+
+(* $Id: Npossec.v,v 1.3 2004/04/06 15:46:05 lcf Exp $ *)
+
+(*#* printing Npos $\mathbb{N}^{+}$ #N<SUP>+</SUP># *)
+
+include "model/structures/Nsec.ma".
+
+(*#* **[Npos]
+The positive natural numbers have some nice properties. Addition as well 
+as multiplication preserve the feature of being positive.
+*)
+
+inline "cic:/CoRN/model/structures/Npossec/plus_resp_Npos0.con".
+
+inline "cic:/CoRN/model/structures/Npossec/Npos_is_suc.con".
+
+inline "cic:/CoRN/model/structures/Npossec/mult_resp_Npos0.con".
+