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Second order approximation in time independent perturbaton theory

  1. Jan 8, 2010 #1
    Is there any physical reason why second order approximation to
    ground state in time independent perturbation theory is always
    negative. I know how to prove it mathematicly but I wonder
    whether one may justify it using only physical arguments.
  2. jcsd
  3. Jan 12, 2010 #2
    because the energy of the tials functions are always more more than the ground state
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