fact: Definition comp_RV (TA TB : eqType) (f : TA -> TB) (X : {RV P -> TA}) : {RV P -> TB} := fun x => f (X x).
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