Equation 55 · The Atlas That Refuses to Close
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Symbol S
S is part of the quantity the equation computes from the expression on the right.
=
The expressions on both sides represent the same quantity under the stated assumptions.
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What the article says around this equation
A number makes the scale concrete without pretending to describe an experiment. Take a spin-one-half wavepacket of electron mass, S = /2 , so that = /(2c) 1.93110^{-13}\ , essentially half the electron’s reduced Compton wavelength. Boost it transverse to its own spin at = v/c = 0.6 . The exact centroid shift between the rest-frame observer and the boosted observer is
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