Abstract
The exact propagator for an electron in a constant uniform magnetic field as the sum over Landau levels is obtained using the direct derivation by standard methods of quantum field theory from exact solutions to the Dirac equation in the magnetic field. The result can be useful for further development of the calculation technique of quantum processes in an external active medium, particularly in the conditions of moderately large field strengths when it is insufficient to take into account only the ground Landau level contribution.
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