Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why is this true?

  1. Jun 19, 2006 #1
    if

    img228.gif

    and

    img229.gif



    then:

    du/dx= img231.gif


    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

    User Avatar
    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!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook