2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/112946In this article we introduce and investigate some new Banach spaces, so - called moment spaces, and consider applications to the Fourier series, singular integral operators, theory of martingales.Functional AnalysisPrimary (1991) 37B30,33K55Some new moment rearrangement invariant spaces; theory and applicationstext