proposition: Lemma monic_neq0 p : p \is monic -> p != 0.
proof: Proof. by rewrite -lead_coef_eq0 => /eqP->; apply: oner_neq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)