(** The different divisions will only differ in the conditions they impose on [modulo]. For NZ, we have only described the behavior on positive numbers. *)
Module Type NZDiv (A : NZOrdAxiomsSig) := DivMod A <+ NZDivSpec A.
Module Type NZDiv' (A : NZOrdAxiomsSig) := NZDiv A <+ DivModNotation A.
Module Type NZDivProp
(Import A : NZOrdAxiomsSig')
(Import B : NZDiv' A)
(Import C : NZMulOrderProp A).
(** Uniqueness theorems *)

Theorem div_unique_exact a b q:
0<=a -> 0<b -> a == b*q -> q == a/b.