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Simple help with notation

  1. Aug 29, 2007 #1
    ok i am pretty good with the topic but i need help with this notation i actually have never seen it before i was wondering if anyone could put in a way that i might have seen it..

    the problem is uxx+uyy = 0
  2. jcsd
  3. Aug 29, 2007 #2
    [tex]u_{xx}=\frac{\partial^{2}u}{\partial x^{2}}[/tex]

    And similarly for uyy, just replace x with y.
    Last edited: Aug 29, 2007
  4. Aug 30, 2007 #3
    If I remember correctly, the general form of that notation is:
    [tex]u_{x_1 , ..,x_n} \equiv \frac{\partial ^n u}{\partial x_n... \partial x_1}[/tex]
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