proposition: Lemma measurable_mulrr D (k : R) : measurable_fun D (fun x => x * k).
proof: Proof. apply: measurable_funTS => /=. by apply: continuous_measurable_fun; exact: mulrr_continuous. 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