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Remarks outline a method to calculate induced charge-density in positron theory, indicating new approaches in field dynamics.
A simple method of obtaining the induced charge-density four vector on the basis of the subtraction formalism of the positron theory is given. Further, in the general case of time-dependent fields the result is calculated directly without use of the Lorentz invariance of the theory.
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Pauli et al. (1936) studied this question.
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