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Simple question about direct integration

  1. Jun 18, 2006 #1
    if I have a equation like this




    [​IMG]



    I know I can integrate so that





    [​IMG]

    but this does not make sense to me because I could think of many U's that if you were to take the derivitive with respect to the squiggly varibale, still includes both variables
     
  2. jcsd
  3. Jun 18, 2006 #2

    Hurkyl

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    If the derivative with respect to xi includes both variables, then how does it look when you differentiate with respect to both xi and to eta?
     
  4. Jun 18, 2006 #3
    [​IMG]
     
    Last edited: Jun 18, 2006
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