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    Trouble with a question in gravitation of MTW

    Homework Statement It is a problem on gravitation of MTW pg 65 exercise 2.5. A particle of rest mass m and 4-momentum is examined by an observer with 4 velocity u. Show E=-p*u under -1,1,1,1 metric Homework Equations Treating c=1, we have u*u=-1 and p=m*u. The Attempt at a...