proposition: Lemma monic_rreg p : p \is monic -> GRing.rreg p.
proof: Proof. by move=> /eqP lp1; apply/rreg_lead; rewrite lp1; apply/rreg1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)