proposition: Lemma lreg_polyZ_eq0 c p : GRing.lreg c -> (c *: p == 0) = (p == 0).
proof: Proof. by rewrite -!size_poly_eq0 => /lreg_size->. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)