(** Well-founded relations on Z. *)

(** We define the following family of relations on [Z x Z]:

    [x (Zwf c) y]   iff   [x < y & c <= y]
 *)

Definition Zwf (c x y:Z) := c <= y /\ x < y.

(* Specifications: *)
Lemma Zwf_well_founded : well_founded (Zwf c).