Geodesic equation proof confusing me

  • #1

Main Question or Discussion Point

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:

Answers and Replies

  • #2
Matterwave
Science Advisor
Gold Member
3,965
326
It looks like they have defined ##u^m\equiv \frac{dx^m}{d\tau}##
 

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