Abstract
Rohrlich's recent claim that the equation of motion for a point charge is symmetric under time reversal is shown to be the result of an inappropriate definition. The equation of motion for a charged sphere of finite size, which is claimed, in contrast, to be asymmetric because of the finite propagation time of its (retarded) self-forces, is shown to possess the same asymmetry (or the same symmetry, depending on the definition) as that for a point charge. The arguments apply similarly to other equations of motion.
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