proposition: Lemma monicXn n : 'X^n \is monic.
proof: Proof. exact/eqP/lead_coefXn. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)