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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) *)
(*   \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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(** For compatibility reasons, this Open Scope isn't local as it should *)
Open Scope Z_scope.
Local Ltac Tauto.intuition_solver ::= auto with zarith.
(** This file contains some notions of number theory upon Z numbers: - a divisibility predicate [Z.divide] - a gcd predicate [gcd] - Euclid algorithm [extgcd] - a relatively prime predicate [rel_prime] - a prime predicate [prime] - properties of the efficient [Z.gcd] function *)
(** The former specialized inductive predicate [Z.divide] is now a generic existential predicate. *)
(** Its former constructor is now a pseudo-constructor. *)
Definition Zdivide_intro a b q (H:b=q*a) : Z.divide a b := ex_intro _ q H.
(** Results concerning divisibility*)
Notation Zone_divide := Z.divide_1_l (only parsing).
Notation Zdivide_0 := Z.divide_0_r (only parsing).
Notation Zmult_divide_compat_l := Z.mul_divide_mono_l (only parsing).
Notation Zmult_divide_compat_r := Z.mul_divide_mono_r (only parsing).
Notation Zdivide_plus_r := Z.divide_add_r (only parsing).
Notation Zdivide_minus_l := Z.divide_sub_r (only parsing).
Notation Zdivide_mult_l := Z.divide_mul_l (only parsing).
Notation Zdivide_mult_r := Z.divide_mul_r (only parsing).
Notation Zdivide_factor_r := Z.divide_factor_l (only parsing).
Notation Zdivide_factor_l := Z.divide_factor_r (only parsing).

(* Specifications: *)
Lemma Zdivide_opp_r a b : (a | b) -> (a | - b).
Notation Zdivide_1 := Z.divide_1_r (only parsing).