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diff --git a/contrib7/ring/ZArithRing.v b/contrib7/ring/ZArithRing.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        *)
-(************************************************************************)
-
-(* $Id: ZArithRing.v,v 1.1.2.1 2004/07/16 19:30:19 herbelin Exp $ *)
-
-(* Instantiation of the Ring tactic for the binary integers of ZArith *)
-
-Require Export ArithRing.
-Require Export ZArith_base.
-Require Eqdep_dec.
-
-Definition Zeq := [x,y:Z]
-  Cases `x ?= y ` of
-    EGAL => true
-  | _ => false
-  end.
-
-Lemma Zeq_prop : (x,y:Z)(Is_true (Zeq x y)) -> x==y.
-  Intros x y H; Unfold Zeq in H.
-  Apply Zcompare_EGAL_eq.
-  NewDestruct (Zcompare x y); [Reflexivity | Contradiction | Contradiction ].
-Save.
-
-Definition ZTheory : (Ring_Theory Zplus Zmult `1` `0` Zopp Zeq).
-  Split; Intros; Apply eq2eqT; EAuto with zarith.
-  Apply eqT2eq; Apply Zeq_prop; Assumption.
-Save.
-
-(* NatConstants and NatTheory are defined in Ring_theory.v *)
-Add Ring Z Zplus Zmult `1` `0` Zopp Zeq ZTheory [POS NEG ZERO xO xI xH].