fact: Definition ext_inj_rV : 'rV[F0]_n -> 'rV[F1]_n := @map_mx _ _ ext_inj 1 n.
imports: mathcomp(all_ssreflect ssralg finalg poly polydiv) mathcomp(cyclic perm matrix mxpoly vector mxalgebra zmodp) mathcomp(finfield falgebra fieldext) ssr_ext ssralg_ext vandermonde linearcode dft poly_decoding grs bch