proposition: Lemma lead_coef0 : lead_coef 0 = 0 :> R.
proof: Proof. exact: lead_coefC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)