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We propose a democratic-type neutrino mass matrix based on $Z_3$ symmetry.This mass matrix predicts the CP violation phase, $\delta=\pi/2$, and themixing angle between the mass eigenstates $\nu_2$ and $\nu_3$, $\sin^2\theta_{23}= \cos^2 \theta_{23}=1/2$ which is essential for the largeatmospheric neutrino mixing, between $\nu_\mu$ and $\nu_\tau$. In this model,the large CP violation effect may be expected.Comment: LaTeX, 22pages, corrected some terminologies, reference adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Large<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>CP</mml:mi></mml:math>violation, large mixings of neutrinos, and a democratic-type neutrino mass matrix

LargeCPviolation, large mixings of neutrinos, and a democratic-type neutrino mass matrix