Module NZDomainProp (Import NZ:NZDomainSig').
Include NZBaseProp NZ.
(** * Relationship between points thanks to [succ] and [pred]. *)
(** For any two points, one is an iterated successor of the other. *)
(** Generalized version of [pred_succ] when iterating *)
(** From a given point, all others are iterated successors or iterated predecessors. *)

Lemma itersucc_or_iterpred : forall n m, exists k, n == (S^k) m \/ n == (P^k) m.