proposition: Lemma coefMn p n i : (p *+ n)`_i = p`_i *+ n.
proof: Proof. exact: (raddfMn (coefp i)). Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)