fact: Definition cpr_eq_set X (E : {set A}) (Y : {RV P -> B}) (F : {set B}) := locked (`Pr_P [ X @^-1: E | Y @^-1: F ]).
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