proposition: Lemma size_poly0 : size (0 : {poly R}) = 0%N.
proof: Proof. by rewrite polyseq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)