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Why does spin add?

  1. Jan 25, 2010 #1
    Why is it that spin adds? I mean sure, the classical analogy tells us that angular momentum is additive, but that I feel is a cop out. What inside of the formalism for quantum mechanics tells us that we should be adding spin of two particles?
  2. jcsd
  3. Jan 25, 2010 #2

    Vanadium 50

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    It doesn't. You can add spin 1 and spin 1 and get spin 1. Or 3 and 4 and get 2. Or...
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