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Derivation of 1st order correction to energy degenerate spec

  1. Oct 13, 2015 #1
    Hello there !

    I need to derive the formula of first order correction to the energy in the case of discrete level of wave function with descrete spectrum.
     
  2. jcsd
  3. Oct 13, 2015 #2

    DrClaude

    User Avatar

    Staff: Mentor

    Any decent textbook on QM should explain that.
     
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