2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185318Using recent data on neutrino oscillations, we argue that a hierarchical solution for neutrino masses in a three-family context is possible, and that the masses of the tau and mu neutrinos are very nearly determined within that possibility. We also examine the predictions of a model that determines neutrino and charged lepton mass matrices as well as its consistency with data.13 pages, 6 figures, technical change to pdf, figures includedHigh Energy Physics - Phenomenologytext