2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39907We show how the nearly bi-maximal mixing scenario comes out naturally from gauged $SO(3)_{F}$ flavor symmetry via spontaneous symmetry breaking. An interesting relation between the neutrino mass-squared differences and the mixing angle, i.e., $Δm_{μe}^2 / Δm_{τμ}^2 \simeq 2|U_{e 3}|^2 $ is obtained. The smallness of the ratio (or $|U_{e 3}|$) can also naturally be understood from an approximate permutation symmetry. Once the mixing element $|U_{e 3}|$ is determined, such a relation will tell us which solution will be favored within this model. The model can also lead to interesting phenomena on lepton-flavor violations.3 pages, using macro ws-p10x7.cls. Talk given at 30th International Conference on High-Energy Physics (ICHEP 2000), 27 Jul - 2 Aug 2000, Osaka, JapanHigh Energy Physics - Phenomenologytext