Homework Statement
It is a problem on gravitation of MTW pg 65 excercise 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...