proposition: Lemma emeasurable_fun_o_infty y : measurable (D `&` [set x | y < f x]).
proof: Proof. by rewrite -preimage_itv_o_infty; exact/mf/emeasurable_itv. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum ssrint interval) mathcomp(finmap fingroup perm rat) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop) reals ereal signed topology numfun normedtype HB(structures) sequences esum measure real_interval realfun exp lebesgue_stieltjes_measure