proposition: Lemma RV02 : snd \o [% unit_RV P, X] =1 X.
proof: Proof. by []. 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