Symbol S
S is part of the quantity the equation computes from the expression on the right.
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Why this formula appears here
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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Read it with the definitions, units, and assumptions supplied by the article.
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Published contexts (1)
A symbol can carry a different meaning in another article. Each occurrence keeps its own guide and term definitions.
Equation 55 · Evolutionary Physics
The Atlas That Refuses to Close
This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.
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
Equation guide → · Article →