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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 Filli�tre *)
(* $Id$ *)
Require Export ZArith.
Require Export ZArith_dec.
Theorem Znotzero : (x:Z){`x<>0`}+{`x=0`}.
Proof.
Intro x. Elim (Z_eq_dec x `0`) ; Auto.
Save.
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