proposition: Lemma polyX_eq0 : ('X == 0) = false.
proof: Proof. by rewrite -size_poly_eq0 size_polyX. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)