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Derivative notation

  1. Sep 22, 2011 #1
    What is the meaning of

    [itex]\frac{\partial F(x)}{\partial(\partial f(x)/\partial x)}[/itex]

    in which a derivative appears in place of the variable x in the denominator?

    Anyone, please?
     
  2. jcsd
  3. Sep 23, 2011 #2

    mathman

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    Science Advisor
    Gold Member

    Let u = ∂f(x)/∂x. Then the expression is ∂F(x)/∂u. In order to make sense out of it you need to know F(x) and f(x).
     
  4. Sep 24, 2011 #3
    Thank you.
     
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