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Renormalization and radiative corrections in QED are studied at finite temperature and density. We use the FermiDirac and BoseEinestein distribution functions in a realtime formalism to generalize the calculations of the electron mass, wavefunction and charge renormalization constants, at high temperatures and chemical potentials. Further, the radiative corrections to the decay rate of a neutral scalar particle H ? e?e? and the leptonic decay of Z boson are reexamined at high temperatures and chemical potentials. Renormalization constants of QED are calculated for > T and T> in the limit T?0 and
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