fact: Definition rowVnextD1 (r : 'rV[letter]_n) n0 m0 : seq letter := [seq r ``_ i | i in 'V n0 :\ m0].
imports: mathcomp(all_ssreflect ssralg fingroup finalg perm zmodp) mathcomp(matrix) ssr_ext ssralg_ext num_occ f2 ssrR hamming tanner linearcode