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Why is this true?

  1. Jun 19, 2006 #1
    if

    [​IMG]

    and

    [​IMG]



    then:

    du/dx=[​IMG]


    I think it is because:

    [tex] du/dx= \Delta(u(\xi,\eta))[/tex]
     
    Last edited: Jun 19, 2006
  2. jcsd
  3. Jun 20, 2006 #2

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    I would think it was because
    [tex]\frac{\partial \xi}{\partial x}= 1[/tex]
    and
    [tex]\frac{\partial \eta}{\partial x}= 1[/tex]

    Since u is a function of two variables,
    [tex]\frac{du}{dx}[/tex]
    isn't equal to anything!
     
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