fact: Definition alternant_PCM : 'M_(k, n) := @GRS_PCM_polynomial n (FinFieldExtType Fqm) a g k.
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