--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||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/non_examples/Npos_no_group".
+
+include "CoRN.ma".
+
+(* $Id: Npos_no_group.v,v 1.6 2004/04/08 08:20:33 lcf Exp $ *)
+
+include "algebra/CGroups.ma".
+
+include "model/monoids/Nposmonoid.ma".
+
+(*#* **Non-example of a group: $\langle$#⟨#[Npos],[[+]]$\rangle$#⟩#
+There is no inverse for multiplication on the positive natural numbers.
+*)
+
+inline "cic:/CoRN/model/non_examples/Npos_no_group/no_inverse_Nposmult.con".
+
+(*#* Hence the natural numbers with multiplication do not form a group.
+*)
+
+inline "cic:/CoRN/model/non_examples/Npos_no_group/no_group_Nposmult.con".
+