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How to use tensors in Mathematica?

Posted 11 years ago
Hello everybody,
I am beginner in Mathematica. I would like to know how to use tensors in Mathematica in general relativity, i.e. when i have defined metric tensor, how to compute tensors that appear in Einstein and Maxwell equations and get exact form of both sides; lowering/uppering four-vectors, covariant derivate etc. Is it built in or is some package needed?

Thank you for any answer.
POSTED BY: Ji?í Ryzner
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