2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59139We study sigma-additive set functions defined on a hereditary subclass of a sigma-algebra and taken values in the extended real line. Analogs of the Jordan decomposition theorem and the Radon-Nikodym theorem are obtained.4 pages. Submitted to Lobachevskii Journal of Mathematics ( http://ljm.ksu.ru)Functional Analysis28A10text