proposition: Lemma size_map_polyC p : size p^:P = size p.
proof: Proof. exact/(size_map_inj_poly polyC_inj). Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)