Neutrino oscillations in the framework of the tree-neutrino mixing

Abstract

In the framework of the three-neutrino mixing the neutrino oscillations in the atmospheric and solar ranges of neutrino mass-squared differences are considered in the leading approximation. Neutrinoless double $\beta$- decay is also discussed.

Comments: Report at the Ist Yamada Symposium on neutrinos and Dark Matter in Nuclear Physics, June 9-14, 2003, Nara, Japan