proposition: Lemma erreval0 : \omega_(f, a, (0 : 'rV_n)) = 0.
proof: Proof. by rewrite /erreval supp0 big_set0. Qed.
imports: mathcomp(all_ssreflect ssralg finalg poly polydiv cyclic) mathcomp(perm matrix mxpoly) ssr_ext ssralg_ext cyclic_code dft