proposition: Lemma mulpz p n : p *~ n = n%:~R *: p.
proof: Proof. by rewrite -mul_polyC polyCMz polyC1 mulrzl. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)