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physics_fun
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I'm reading some texts on general relativity and I am wondering how one can mathematically proof that the covariant derivative (wrt mu) of the four-vector j^mu equals zero.
I know that the covarient derivative (wrt nu) of F^mu^nu equals the four-current times some costant and that you should use this to obtain the final result, but I can't find in any text how you should do this exactly.
Anyone who knows the proof?
I know that the covarient derivative (wrt nu) of F^mu^nu equals the four-current times some costant and that you should use this to obtain the final result, but I can't find in any text how you should do this exactly.
Anyone who knows the proof?