proposition: Lemma closed_measurable (A : set R) : closed A -> measurable A.
proof: Proof. by move/closed_openC/open_measurable/measurableC; rewrite setCK. 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