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A kinetic equation for a plasma of electrons and infinite mass ions is derived which exhibits no divergences for any impact parameter. The basic expansion used is in nλD3, the number of particles in a Debye sphere. The collision operator has Boltzmann, Fokker-Planck, and Lenard-Balescu behavior in the appropriate impact parameter regimes.
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Frieman et al. (1963) studied this question.
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