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_mul n m : Z.abs_nat (n*m) = (Z.abs_nat n * Z.abs_nat m)%nat.