proposition: Lemma fdistA_RV3 : fdistA `p_[% X, Y, Z] = `p_[% X, [% Y, Z]].
proof: Proof. by rewrite /fdistC12 /dist_of_RV /fdistA fdistmap_comp. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum matrix) mathcomp(Rstruct reals) Reals Lra ssrR Reals_ext realType_ext logb ssr_ext ssralg_ext bigop_ext fdist