proposition: Lemma size_poly_leq0P p : reflect (p = 0) (size p <= 0).
proof: Proof. by apply: (iffP idP); rewrite size_poly_leq0; move/eqP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)