proposition: Lemma syndromep0 : syndromep u 0 t = 0.
proof: Proof. by rewrite -[in LHS](subrr 0) syndromepB subrr. Qed.
imports: mathcomp(all_ssreflect ssralg finalg poly polydiv cyclic) mathcomp(perm matrix mxpoly) ssr_ext ssralg_ext cyclic_code dft