Feynman-Wheeler theory

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In physics, Feynman-Wheeler theory is a nonlocal, Lorentz invariant, theory of electromagnetism in which charged particles do not act on themselves, but only on other particles. As a consequence, the motion of a charged particle depends on the past and future motions of all other charged particles. This fantastic theory avoids the problem of the self-mass of a charged particle, but requires considering future motions, and so is not commonly used.