fact: Definition cast_RV_fdist_rV1 (U : finType) (P : real_realType.-fdist U) (T : eqType) (X : {RV P -> T}) : {RV (P `^ 1) -> T} := fun x => X (x ``_ ord0).
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