(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://books.google.com/books?id=Xm...42EpgKaxsi5Dw&sig=6cUrZKqmPMoe0QBRTSYNnipNRw4

In problem 6.1, I am trying to show "why the following relations hold"

for the first one, that would just be the definition of ds^2 if you had (cdt)^2 in there but I cannot figure out what happened to it

for the the second one, I am confused about how that can possible be write because the expression for v_perp on 110 implies that it is a vector with the same number of components as X^mu but the y has two fewer components than X. What gives?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Zwiebach page 113

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