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\subsection{Neutrino Oscillation}  The motivation for neutrino oscillation was discused in section REFERENCE. Lets assume, like Pontecorvo suggested, that neutrinos of definite flavor are in fact superpositions of mass eigenstates eigenstates. That is  \begin{equation}  \mid \nu_i \rangle = \sum\limits_{\alpha} U_{i \alpha} \mid \nu_{\alpha} \rangle