I'm sorry, but the formulae pertinent to this question are too difficult for my spotty knowledge of tex. This means that the only people who can help me with this are those who have a copy of Ryder's QFT available.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

My problem comes from page 58 of Ryder's QFT. I think the text is asking me to show that equation 2.180 is an example of equation 2.179 with an appropriate choice of [tex]a^\alpha[/tex].

2. Relevant equations

Too complicated for me to reproduce. Please refer to the book if you have it.

3. The attempt at a solution

Actually, I have a solution for this by differentiating the Lorentz transformation equations with respect to v and treating x as a constant. For instance:

[tex]x' = \gamma(x + vt)[/tex]

[tex]\frac{\partial}{\partial v}(x + vt)(1-v^2)^{-1/2}|(v = 0) = t(1-v^2)^{-1/2} + (x + vt)v(1-v^2)^{-3/2}|(v = 0) = t[/tex]

I just feel funny about treating x as a constant when take the derivative with respect to v. If its wrong, what direction should I go? If it's right, why is it allowed to ignore the relation between x and [tex]\dot x[/tex]?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Ignoring a relationship.

**Physics Forums | Science Articles, Homework Help, Discussion**