How come you can express the up and down spins

  • Thread starter dudy
  • Start date
  • #1
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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) ?
 

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