I'm looking at McMahon's(adsbygoogle = window.adsbygoogle || []).push({}); Quantum Mechanics Demystifiedand in the angular momentum chapter he introduces "generalized" angular momentumJ, which is the sum of a particle's orbital angular momentum and its spin.

It seems strange to me that these two things can be simply added together. Isn't "spin" only an indication of a subatomic particle's built in magnetic moment, completely unrelated to angular momentum in a classical sense?

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# What is spin?

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