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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(* Certification of Imperative Programs / Jean-Christophe Fillitre *)
(* $Id: ProgInt.v,v 1.2.2.1 2004/07/16 19:30:00 herbelin Exp $ *)
Require Export ZArith.
Require Export ZArith_dec.
Theorem Znotzero : forall x:Z, {x <> 0%Z} + {x = 0%Z}.
Proof.
intro x. elim (Z_eq_dec x 0); auto.
Qed.
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