proposition: Lemma measurable_fubini_F : measurable_fun setT F.
proof: Proof. rewrite FE. by apply: emeasurable_funB; [exact: measurable_Fplus|exact: measurable_Fminus]. 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