proposition: Lemma size_map_poly_id0 p : f (lead_coef p) != 0 -> size p^f = size p.
proof: Proof. by move=> nz_fp; apply: size_poly_eq. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)