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Homework Help: Derivation of the Hamiltonian of the Heisenberg model

  1. Oct 21, 2007 #1
    1. The problem statement, all variables and given/known data
    Show that the Hamiltonian of the Heisenberg model can be written as:

    2. Relevant equations
    As above

    3. The attempt at a solution
    I read through this page: http://phycomp.technion.ac.il/~riki/H2_molecule.html
    but I still don't really understand.
  2. jcsd
  3. Oct 21, 2007 #2
    Sorry that second equation should be
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