proposition: Lemma lead_coef_map_inj p : lead_coef p^f = f (lead_coef p).
proof: Proof. by rewrite !lead_coefE size_map_inj_poly coef_map_id0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)