  Extending the minimal standard model of particle interactions (without
right-handed singlet neutrinos) to include a heavy scalar triplet $\xi$ to
obtain nonzero Majorana neutrino masses, I derive the following simple
realistic connection between atmospheric and solar neutrino vacuum
oscillations: $(\Delta m^2)_{sol} (\Delta m^2)_{atm} / m_\nu^4 ~(\sin^2 2
\theta)_{atm} = 2 I^2$, where $m_\nu$ is the assumed common approximate mass of
each neutrino (which may be suitable for hot dark matter) and $I = (3/16
\pi^2)(G_F/\sqrt 2) m_\tau^2 \ln (m_\xi^2/m_W^2)$ comes from the radiative
splitting of the degeneracy due to the charged leptons.
