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The four-parameter tetrahedral neutrino mass matrix introduced earlier by the author is studied in two specific limits, both having only two parameters and resulting in ₁₃=0, ₂₃=/4, and tan^2₁₂=1/2. One limit corresponds to a recent proposal which predicts a normal ordering of neutrino masses; the other is new and allows both inverted and normal ordering.
Ernest Ma (Thu,) studied this question.
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