fact: Definition mutual_info_chan P (W : `Ch(A, B)) := `H P + `H(P `o W) - `H(P , W).
imports: mathcomp(all_ssreflect all_algebra) Reals mathcomp(Rstruct) ssrR Reals_ext logb ssr_ext ssralg_ext bigop_ext fdist proba entropy jfdist_cond