proposition: Lemma locally_integrableB D f g : locally_integrable D f -> locally_integrable D g -> locally_integrable D (f \- g)%R.
proof: Proof. by move=> lf lg; apply: locally_integrableD => //; exact: locally_integrableN. 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