proposition: Lemma mulrz_ge0 x n (x0 : 0 <= x) (n0 : 0 <= n) : 0 <= x *~ n.
proof: Proof. by rewrite -(mul0rz _ n) ler_wpMz2r. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)