reflexivity.
unfold lt_absZ in |- *; unfold absZ in |- *; unfold ltZ in |- *;
unfold leZ in |- *; intros.
elim (le_Sn_O n H).
unfold lt_absZ in |- *; unfold absZ in |- *; unfold ltZ in |- *;
unfold leZ in |- *; intros.
elim (le_Sn_O n H).
Qed.

Lemma tech_posOZ_pos : forall n : nat, leZ OZ (posOZ n).
intros; elim n.