proposition: Lemma Radon_Nikodym_integral A : nu `<< mu -> measurable A -> nu A = \int[mu]_(x in A) Radon_Nikodym x.
proof: Proof. by move=> numu; rewrite (Radon_NikodymE numu); case: cid => ? [? ?]; exact. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum ssrint interval) mathcomp(finmap fingroup perm rat) mathcomp(mathcomp_extra boolp classical_sets cardinality) mathcomp(functions fsbigop set_interval) HB(structures) reals ereal signed topology numfun normedtype sequences esum measure realfun lebesgue_measure lebesgue_integral