2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165330We characterize Osserman and conformally Osserman Riemannian manifolds with the local structure of a warped product. By means of this approach we analyze the twisted product structure and obtain, as a consequence, that the only Osserman manifolds which can be written as a twisted product are those of constant curvature.Differential Geometry53C20; 53C50text