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Contour integration of real functions

  1. Jan 28, 2013 #1
    I have a problem with choosing a contour for integration... Can someone explain to me when to use a keyhole contour and when a semi-circle? Thanks...:)
    Last edited: Jan 28, 2013
  2. jcsd
  3. Jan 28, 2013 #2
    Use keyhole when you need to avoid singularities.
  4. Jan 28, 2013 #3
    Singularities on real axis?
  5. Jan 28, 2013 #4
    Yes. Like (sin x)/x.
  6. Jan 28, 2013 #5
    Thanks man.:)
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