Hello,
I'm still new to Maxima ... I would like use Maxima to write out the
mixed directional derivatives like (grad(grad C).a).b, where a and b are
vectors and C(x,y,z) is a scalar function.
Please visit http://en.wikipedia.org/wiki/Del#Directional_derivative for
an example of a first-order directional derivative.
Thanks,
- Olumide