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Geodesic equation proof confusing me

  1. Jan 16, 2015 #1
    Hi all, I was looking through this proof and have no idea where the "u" comes from., any help apreciated.
    splaystyle+++%5Cfrac%7Bd%5E%7B2%7Dx%5E%7Bm%7D%7D%7Bd%5Ctau%5E%7B2%7D%7D+&bg=eedbbd&fg=000000&s=0.png latex.png latex.png
    http://s0.wp.com/latex.php?latex=%5Cdisplaystyle++&bg=eedbbd&fg=000000&s=0 latex.png latex.png
    http://s0.wp.com/latex.php?latex=%5Cdisplaystyle++&bg=eedbbd&fg=000000&s=0 latex.png latex.png
    http://s0.wp.com/latex.php?latex=%5Cdisplaystyle++&bg=eedbbd&fg=000000&s=0 latex.png latex.png
    http://s0.wp.com/latex.php?latex=%5Cdisplaystyle++&bg=eedbbd&fg=000000&s=0 latex.png latex.png
    http://s0.wp.com/latex.php?latex=%5Cdisplaystyle++&bg=eedbbd&fg=000000&s=0 latex.png latex.png
    where



    latex.png
     
    Last edited: Jan 16, 2015
  2. jcsd
  3. Jan 16, 2015 #2

    Matterwave

    User Avatar
    Science Advisor
    Gold Member

    It looks like they have defined ##u^m\equiv \frac{dx^m}{d\tau}##
     
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