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The velocity and angular momentum of a free Dirac electron
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physics.gen-ph
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angularcommutesdiracelectronfreehamiltonianmomentummotion
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It is shown that, in Dirac theory, there is a spatial velocity of a free electron which commutes with the Hamiltonian, so it is a conserved quantity of the motion. Furthermore, there is a spatial orbital angular momentum which also commutes with the Hamiltonian and is a constant of the motion.
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