proposition: Lemma mulrz_nat (n : nat) x : x *~ n%:R = x *+ n.
proof: Proof. by rewrite -scalezrE scaler_nat. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)