fact: Record errvec n (F : fieldType) t := Errvec { errvect :> 'rV[F]_n ; errsupp : #| supp errvect | <= t }.
imports: mathcomp(all_ssreflect ssralg finalg poly polydiv cyclic) mathcomp(perm matrix mxpoly) ssr_ext ssralg_ext cyclic_code dft