2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77903A concept of multiplicator of symmetric function space concerning to projective tensor product is introduced and studied. This allows to obtain some concrete results. In particular, the well-known theorem of R. O'Neil about the boundedness of tensor product in the Lorentz spaces L_{p,q} is discussed.17 pagesFunctional AnalysisClassical Analysis and ODEs46B70 (Primary), 46B20, 48B40 (secondary)text