proposition: Lemma measurable_funB D f g : measurable_fun D f -> measurable_fun D g -> measurable_fun D (f \- g).
proof: Proof. by move=> ? ?; apply: measurable_funD =>//; exact: measurableT_comp. 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