Module Zabs2Nat.
(** Results about [Z.abs_nat], converting absolute values of [Z] integers to [nat]. *)
(** [Z.abs_nat], basic equations *)
(** [Z.abs_nat] and usual operations, with non-negative integers *)

Lemma inj_lt n m : 0<=n -> 0<=m -> (n<m <-> (Z.abs_nat n < Z.abs_nat m)%nat).