proposition: Lemma ltz_nat m n : (m < n :> int) = (m < n)%N.
proof: Proof. by rewrite ltnNge ltNge lez_nat. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)