fact: Definition enc_pre_img_partition := enc_pre_img @: [set P in P_ n ( A ) | enc_pre_img P != set0].
imports: mathcomp(all_ssreflect ssralg ssrnum perm) mathcomp(matrix) mathcomp(Rstruct) Reals ssrR Reals_ext realType_ext ssr_ext ssralg_ext logb fdist proba entropy num_occ channel_code channel typ_seq