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Homework Help: Analytic continuation

  1. Feb 19, 2007 #1
    What is analytic continuation? Seems to be used often in QFT.
  2. jcsd
  3. Feb 19, 2007 #2


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    Actually, it more mathematics than physics- If a function is analytic on an open subset of the complex numbers, then there is a unique way to define it outside that set in such a way that it is analytic for all complex numbers.
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