proposition: Lemma size_poly1 : size (1 : {poly R}) = 1.
proof: Proof. by rewrite polyseq1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)