proposition: Lemma fdistX_RV2 : fdistX `p_[% X, Y] = `p_[% Y, X].
proof: Proof. by rewrite /fdistX /dist_of_RV 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