What is this ecuation about?

[frontman212]

Hi everyone! I am a physics passionate and recently I got a t-shirt as a present that looks like this:

and I really want to know what is this ecuation about. I have done some research and I am almost sure that it's related to the General Relativity because of the Wikipedia's Relativity entry jeje but if someone could help me more I would really appreciate it!

Thanks :)

 

[guest1234]

Looks like the geodesic equation. Einstein summation convention is used in the Wikipedia article.

 

[frontman212]

thanks! It looks similar to the ecuations described in the geodesics entry. I will keep on searching to find more about it :)