fact: Variables (A B : finType) (W : `Ch(A, B)) (n : nat) (tb : 'rV[B]_n).
imports: mathcomp(all_ssreflect all_algebra) Reals mathcomp(Rstruct) ssrR Reals_ext logb ssr_ext ssralg_ext bigop_ext fdist proba entropy jfdist_cond