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I've been reading the excelent review from Eric Poisson found here.

While reading I found a proof that I can't make... I can't find a way to go from Eq.(19.3) to the one before Eq.(19.4) (which is unnumbered).

I've been able to do some progress, but can't get the right answer... I'll send what I've done so far in attachment. Please somebody help me. It's getting really frustating...

Thank you

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# Geodesic from energy-momentum Conservation

Can you offer guidance or do you also need help?

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