(* -*- coding: utf-8 -*- *)
(************************************************************************)
(*         *   The Coq Proof Assistant / The Coq Development Team       *)
(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
(* <O___,, *       (see CREDITS file for the list of authors)           *)
(*   \VV/  **************************************************************)
(*    //   *    This file is distributed under the terms of the         *)
(*         *     GNU Lesser General Public License Version 2.1          *)
(*         *     (see LICENSE file for the text of the license)         *)
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(** Binary Integers (Pierre Crégut, CNET, Lannion, France) *)
Require Export Arith_base.
Require Export Compare_dec.
Local Open Scope Z_scope.
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(** * Moving terms from one side to the other of an inequality *)

Theorem Zegal_left n m : n = m -> n + - m = 0.