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May 30, 2013 at 20:41 comment added joshphysics @Kazz8 $d^3x = dx dy dz$ is the volume element in three, Euclidean dimensions. I'll try to include that proof as soon as I can (I haven't actually tried it yet.)
May 30, 2013 at 18:51 comment added pppqqq Thank you for your answer. Yes, this was basicly my same idea (what does $d^3 x$ mean?), but now I wouldn't know how to act on the last integral. Could you give, as an example, a complete proof that $ \frac{\text d \mathbf{L} }{\text d t}=\mathbf{\Gamma}$?
May 30, 2013 at 17:21 history answered joshphysics CC BY-SA 3.0