Simple question about direct integration

  1. if I have a equation like this




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    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. Hurkyl

    Hurkyl 16,089
    Staff Emeritus
    Science Advisor
    Gold Member

    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. [​IMG]
     
    Last edited: Jun 18, 2006
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