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Spin problem

  1. Aug 27, 2012 #1
  2. jcsd
  3. Aug 27, 2012 #2

    DrDu

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    An even vertex is a vertex whose order is an even number (2 or 4). Yes, the spin products in Fig. 6.13 all vanish according to the definition.
     
  4. Aug 27, 2012 #3
    And what is with ##\upsilon^0## term? Is that like vacum?
     
  5. Aug 27, 2012 #4

    DrDu

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    What's the problem with it? You want to have the system to have a partition function in the case J=0, too, don't you?
     
  6. Aug 27, 2012 #5
    Yes. Tnx.
     
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