proposition: Lemma eval_Isnull k p e : qf_eval e (Isnull p k) = qf_eval e (k (eval_poly e p == 0)).
proof: Proof. by rewrite eval_Size size_poly_eq0. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(finfun path matrix) mathcomp(bigop order ssralg poly polydiv ssrnum zmodp div ssrint) mathcomp(polyorder polyrcf interval polyXY) mathcomp(qe_rcf_th ordered_qelim mxtens)