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Is π|spin up>=|spin down>?

  1. Feb 5, 2015 #1
    Is π|spin up>=|spin down>?, where π is the parity operator.

    I can't find a definitive answer from Sakurai.
  2. jcsd
  3. Feb 5, 2015 #2

    Simon Bridge

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    Try flipping one spacial coordinate and see what happens to the resulting spin?
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