Matter wavesThe following, second part of the calculation, relies on the Schrodinger equation. We are now letting neutrinos of different mass (n1 and n2) propagate with "matter waves" of a different frequency (the e-iEt terms). The last two lines on this page say that if we start with all muon neutrinos and no tau neutrinos at time (and distance) of zero, and then look at some later time/distance, lo and behold, some of the muon neutrinos have changed into tau neutrinos.
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