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(***********************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA-Rocquencourt & LRI-CNRS-Orsay *)
(* \VV/ *************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(***********************************************************************)
(* Certification of Imperative Programs / Jean-Christophe Filliâtre *)
(* $Id$ *)
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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