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

I am trying to solve produce an equation and the last step requires that

[tex] \frac{ \partial {m \mathbf{v}}}{\partial {s} } = \frac{ \partial { \mathbf{p}}}{c \partial {t} } [/tex]

where ds is the infinitesimal Lorentz invariant length, v is velocity, and p is momentum

The problem is that I do not know how to justify this last step.

2. Relevant equations

3. The attempt at a solution

I tried rewriting ds in terms of tau, but then it seemed that this proper time to be equal to non-proper time which is not true.

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# Homework Help: Special relativity question

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