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I Why do we need perturbation theory

  1. Dec 13, 2016 #1
    Why do we need perturbation theory in quantum mechanics?
  2. jcsd
  3. Dec 13, 2016 #2

    Simon Bridge

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    Because solving the schrodinger equation for the complete system in one go is too hard.
  4. Dec 13, 2016 #3

    A. Neumaier

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    Most quantum systems are not exactly solvable, and perturbation theory is one very important approach to solving them approximately.
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