Four Puzzles of Neutrino Mixing

Abstract

There are four puzzling questions about by the magnitudes of neutrino mixings and mass splittings. A brief sketch is given of the various kinds of models of neutrino masses and how they answer these questions. Special attention is given to so-called "lopsided" models.

Comments: 12 pages, LaTeX. Talk at NOON2001 conference, Univ. of Tokyo, Dec. 5-8, 2001