2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62371We define a multidimensional rearrangement, which is related to classical inequalities for functions that are monotone in each variable. We prove the main measure theoretical results of the new theory and characterize the functional properties of the associated weighted Lorentz spaces.22 pagesClassical Analysis and ODEsFunctional Analysis46E30, 46B25text