proposition: Lemma pmulrn (R : zmodType) (x : R) (n : nat) : x *+ n = x *~ n%:Z.
proof: Proof. by []. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)