Section POrder.
Implicit Types (T : porderType disp).
Definition porderMixin n T := [porderMixin of n.-tuple T by <:].
Canonical porderType n T := POrderType disp' (n.-tuple T) (porderMixin n T).

Lemma leEtprod n T (t1 t2 : n.-tuple T) :
t1 <= t2 = [forall i, tnth t1 i <= tnth t2 i].