By resorting to recent results on the Quantum Field Theory of mixed
particles, we discuss some aspects of three flavor neutrino mixing. Particular
emphasis is given to the related algebraic structures and their deformation in
the presence of CP violation. A novel geometric phase related to CP violation
is introduced.Comment: 10 pages, 2 figures. Presented at the XII International Baksan School
"Particles and Cosmology", Baksan Valley, Kabardino-Balkaria, Russian
Federation - April 21 - 26, 200
