fact: Definition decoder : decT F [finType of 'rV[F]_(n - d.+1).+1] n := [ffun y => omap RS_discard (RS_repair a _ d y)].
imports: mathcomp(all_ssreflect ssralg finalg poly polydiv cyclic) mathcomp(perm matrix mxpoly vector mxalgebra zmodp) ssr_ext ssralg_ext poly_ext channel_code decoding linearcode hamming dft poly_decoding euclid grs cyclic_code