Abstract
Under an assumption that the 2{r_reversible}3 symmetry is broken only through phases, we give a systematic investigation of possible lepton mass matrix forms without referring to explicit parameter values. Two types of the 2{r_reversible}3 symmetry are investigated: one is that the left- and right-handed fields (f{sub L},f{sub R}) obey the symmetry, and another one is that only f{sub L} obeys the symmetry. In the latter case, in spite of no 2{r_reversible}3 symmetry in the Majorana mass matrix M{sub R} for {nu}{sub R}, the neutrino seesaw mass matrix still obeys the 2{r_reversible}3 symmetry. Possible phenomenology is discussed.
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