Content deleted Content added
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:<math>
\mathbf{v_i} \ \stackrel{\mathrm{def}}{=}\
\left(
\frac{\mathrm{d}\mathbf{r}}{\mathrm{d}t} =
\left[ \left(\frac{\mathrm{d}}{\mathrm{d}t}\right)_{\mathrm{r}} + \boldsymbol{\Omega} \times \right] \boldsymbol{r} =
|