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diff --git a/contrib/correctness/ProgInt.v b/contrib/correctness/ProgInt.v
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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 Filliātre *)
-
-(* $Id: ProgInt.v 5920 2004-07-16 20:01:26Z herbelin $ *)
-
-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.
-\ No newline at end of file