proposition: Lemma size_polyC_leq1 (c : R) : (size c%:P <= 1)%N.
proof: Proof. by rewrite size_polyC; case: (c == 0). Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)