proposition: Lemma measurable_maxr D f g : measurable_fun D f -> measurable_fun D g -> measurable_fun D (f \max g).
proof: Proof. by move=> mf mg mD; move: (mD); apply: measurable_fun_if => //; [exact: measurable_fun_ltr|exact: measurable_funS mg|exact: measurable_funS mf]. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum ssrint interval) mathcomp(finmap fingroup perm rat) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop) reals ereal signed topology numfun normedtype HB(structures) sequences esum measure real_interval realfun exp lebesgue_stieltjes_measure