2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44644We show how a 17 keV neutrino, the solar neutrino problem, and the atmospheric muon-neutrino deficit could all be the low-energy residues of the same pattern of lepton-number breaking at and above the weak scale, with no requirement for fine-tuning a symmetry-breaking scale at lower energies. Talk given at ``Beyond the Standard Model III'', Carleton University, June 1992.6 pages, (LaTeX) McGill-92/36High Energy Physics - Phenomenologytext