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How come you can express the up and down spins

  1. Aug 16, 2010 #1
    I don't understand the following regarding spin:
    1. How come you can express the up and down spins in any given direction, using the |+>,|-> in the z direction?
    2. Why do I need two vectors (|->,|+>) to express a quantity that can only be either (1) or (-1) ?
     
  2. jcsd
  3. Aug 16, 2010 #2
    Last edited by a moderator: Apr 25, 2017
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