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This tag is for questions regarding to torque, which is a measure of the increase in angular momentum over time.
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Prove that the derivative of the relativistic angular momentum is the relativistic torque
In the book "relativity" by Vincenzo Barone, the relativistic angular momentum tensor is defined as:
$L^{ij}= x^ip^j - x^jp^i$
(With the indexes $i,j$ going from 0 to 3)
And the relativistic torque tensor … :
$\frac{dL^{ij}}{ds} = N^{ij}$
But if you derive the momentum with respect to the path element d$s$ you should end up with four terms (two for each term of $\mathbf L$) of which two are those of the torque …