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In this paper we used the Feynman path integral technique to calculate propagators for the Feshbach–Villars equation and the generalized Feshbach–Villars equation. We calculate these propagators for three cases: for a free particle, for a particle in a constant magnetic field and in an inhomogeneous magnetic field. Some special relations between Pauli matrices, which appear in the Feshbach–Villars...
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