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diff --git a/matita/contribs/CoRN-Decl/model/semigroups/Zsemigroup.ma b/matita/contribs/CoRN-Decl/model/semigroups/Zsemigroup.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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* This file was automatically generated: do not edit *********************)
+
+set "baseuri" "cic:/matita/CoRN-Decl/model/semigroups/Zsemigroup".
+
+include "CoRN.ma".
+
+(* $Id: Zsemigroup.v,v 1.6 2004/04/08 08:20:35 lcf Exp $ *)
+
+include "model/setoids/Zsetoid.ma".
+
+include "algebra/CSemiGroups.ma".
+
+(*#* **Examples of semi-groups: $\langle$#⟨#[Z],[[+]]$\rangle$#⟩# and $\langle$#⟨#[Z],[[*]]$\rangle$#⟩#
+***$\langle$#⟨#[Z],[[+]]$\rangle$#⟩#
+*)
+
+inline "cic:/CoRN/model/semigroups/Zsemigroup/Z_as_CSemiGroup.con".
+
+(*#* The term [Z_as_CSemiGroup] is of type [CSemiGroup]. Hence we have proven that [Z] is a constructive semi-group. *)
+
+(*#* ***$\langle$#⟨#[Z],[[*]]$\rangle$#⟩#
+*)
+
+inline "cic:/CoRN/model/semigroups/Zsemigroup/Z_mul_as_CSemiGroup.con".
+