proposition: Lemma integrable_abse (D : set T) (f : T -> \bar R) : mu.-integrable D f -> mu.-integrable D (abse \o f).
proof: Proof. move=> /integrableP[mf foo]; apply/integrableP; split. exact: measurableT_comp. by under eq_integral do rewrite abse_id. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrnum ssrint interval finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop ) signed reals ereal topology normedtype sequences real_interval esum measure lebesgue_measure numfun