In algebraic notation I have a parametric curve
x=u(t), y=v(t), z=v(t)
and need radius_of_curvature(t)
Would like the verb r taking a gerund argument,
u`v`w r t
but requires first and second derivatives.
In LaTeX linear notation, with \times representing cross product,
curvature is
\[\frac{\|\vec{r'}\|^3}{\|\vec{r'}\times\vec{r''}\|}\]
This being messy, derivatives of a gerund packed back into a gerund
would be great, then `:0 would generate the vectors.
Thanks, Dave.
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