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Comment: 11 pages, no figures. Some typos corrected. More typos corrected
Comment: 19 pages, 6 figures; Corrected typos and added reference
Comment: 33 pages, Latex, 6 Z-compressed and uuencoded figures
Radiative corrections to neutrino mixing and CP violation are analyzed in the minimal seesaw model with two heavy right-handed neutrinos. We find that textures of the effective Majorana neutrino mass matrix are essentially stable against renormalization effects. Taking account of the Frampton-Glashow-Yanagida ansatz for the Dirac neutrino Yukawa coupling matrix, we calculate the running effects of light neutrino masses, lepton flavor mixing angles and CP-violating phases for both $m_1 =0$ (normal mass hierarchy) and $m_3 =0$ (inverted mass hierarchy) cases in the standard model and in its minimal supersymmetric extension. Very instructive predictions for the cosmological baryon number asymmetry via thermal leptogenesis are also given with the help of low-energy neutrino mixing quantities.
Comment: 11 pages, 9 figures, axodraw.sty
Comment: Minor modifications in the text. Version to appear in Nucl. Phys. B
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