End MoreN2Z.
Module Zabs2N.
(** Results about [Z.abs_N], converting absolute values of [Z] integers to [N]. *)

(** [Z.abs_N] and usual operations, statements with [Z.abs] *)
Lemma inj_succ_abs n : Z.abs_N (Z.succ (Z.abs n)) = N.succ (Z.abs_N n).