proposition: Lemma dim_len : m <= n.
proof: Proof. by rewrite len_dim -ltnS prednK ?expn_gt0 // ltn_expl. Qed.
imports: mathcomp(all_ssreflect ssralg fingroup finalg perm zmodp) mathcomp(matrix mxalgebra vector) mathcomp(Rstruct) realType_ext ssr_ext ssralg_ext f2 linearcode natbin ssrR hamming bigop_ext fdist proba channel channel_code decoding binary_symmetric_channel