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## Main Question or Discussion Point

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 :)

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 :)