End Z.
Bind Scope Z_scope with Z.t Z.
(** Re-export Notations *)
Number Notation Z Z.of_num_int Z.to_num_int : Z_scope.
Infix "+" := Z.add : Z_scope.
Notation "- x" := (Z.opp x) : Z_scope.
Infix "-" := Z.sub : Z_scope.
Infix "*" := Z.mul : Z_scope.
Infix "^" := Z.pow : Z_scope.
Infix "/" := Z.div : Z_scope.
Infix "mod" := Z.modulo (at level 40, no associativity) : Z_scope.
Infix "÷" := Z.quot (at level 40, left associativity) : Z_scope.
Infix "?=" := Z.compare (at level 70, no associativity) : Z_scope.
Infix "=?" := Z.eqb (at level 70, no associativity) : Z_scope.
Infix "<=?" := Z.leb (at level 70, no associativity) : Z_scope.
Infix "<?" := Z.ltb (at level 70, no associativity) : Z_scope.
Infix ">=?" := Z.geb (at level 70, no associativity) : Z_scope.
Infix ">?" := Z.gtb (at level 70, no associativity) : Z_scope.
Notation "( x | y )" := (Z.divide x y) (at level 0) : Z_scope.
Infix "<=" := Z.le : Z_scope.
Infix "<" := Z.lt : Z_scope.
Infix ">=" := Z.ge : Z_scope.
Infix ">" := Z.gt : Z_scope.
Notation "x <= y <= z" := (x <= y /\ y <= z) : Z_scope.
Notation "x <= y < z" := (x <= y /\ y < z) : Z_scope.
Notation "x < y < z" := (x < y /\ y < z) : Z_scope.
Notation "x < y <= z" := (x < y /\ y <= z) : Z_scope.
(** Conversions from / to positive numbers *)
Module Pos2Z.

Lemma inj_add x y : 0 < x -> 0 < y ->
Z.to_pos (x+y) = (Z.to_pos x + Z.to_pos y)%positive.