proposition: Lemma indic_fubini_tonelli_G_ge0 x : 0 <= G x.
proof: Proof. by apply: integral_ge0 => // y _; rewrite lee_fin. 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