proposition: Lemma dE x : d x = f x.
proof: Proof. by rewrite /d; unlock. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum fingroup finalg matrix) Reals Lra mathcomp(Rstruct) ssrR Reals_ext realType_ext logb ssr_ext ssralg_ext bigop_ext fdist proba jfdist_cond entropy