proposition: Lemma rreg_polyMC_eq0 c p : GRing.rreg c -> (p * c%:P == 0) = (p == 0).
proof: Proof. by rewrite -!size_poly_eq0 => /rreg_size->. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)