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What is an integral with a circle through it?

  1. Sep 13, 2009 #1
    [tex]\oint[/tex] what's the difference?
     
  2. jcsd
  3. Sep 13, 2009 #2
    This is a symbol usually used to denote a line integral over a closed curve (a curve homeomorphic to the circle, hence the circle symbol), but it can also be used for an integral over a closed manifold in more general circumstances.
     
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