On simple and subtle properties of neutrinos

Abstract

Neutrino flavors, light and heavy, are discussed in their interdependence within the minimal unifying gauge group of SO10. The general situation which excludes the existence of an {\it exact} symmetry from which {\it exactly} vanishing light neutrino masses would follow is discussed. {\it Subtle} and {\it simple} consequences for 'low-low' oscillation phenomena are presented in a general framework.

14 pages, no figures