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A Flatness Problem Differential Equation

  1. Dec 3, 2016 #1
    Hello to everybody,

    Since 3 days, I've been trying to obtain Eq. (173) from https://ned.ipac.caltech.edu/level5/Sept03/Trodden/Trodden5.html

    I know I need to derivate with respect to a, but it is being impossible to obtain the final answer. Can anybody help me with a detailed derivation?

    Thank you in a advance
     
  2. jcsd
  3. Dec 4, 2016 #2

    Chalnoth

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    Science Advisor

    How are you going about the derivation?
     
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