proposition: Lemma iavg_ge0 f A : 0 <= iavg f A.
proof: Proof. by rewrite /iavg mule_ge0 ?integral_ge0// lee_fin invr_ge0// fine_ge0. 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