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(*         *      The Rocq Prover / The Rocq Development Team           *)
(*  v      *         Copyright INRIA, CNRS and contributors             *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
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(*         *     GNU Lesser General Public License Version 2.1          *)
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(** Some more properties of [even] and [odd]. *)
Module Type ZParityProp (Import Z : ZAxiomsSig')
(Import ZP : ZMulOrderProp Z).
Include NZParityProp Z Z ZP.

Lemma even_opp : forall n, even (-n) = even n.