2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192847The recent devolopment on the charged lepton mass forumula m_e+m_μ+m_τ={2/3}(\sqrt{m_e}+\sqrt{m_μ}+\sqrt{m_τ})^2 is reviewed. An S_3 or A_4 model will be promising for the mass relation.Latex, 11 pages, no figure, Talk at Internationa Workshop on Neutrino Masses and Mixing, at Shizuoka, Japan, December, 17-19, 2006High Energy Physics - Phenomenologytext