Comment #7 on issue 1905 by [email protected]: Differentiation and
Geometric Algebra
http://code.google.com/p/sympy/issues/detail?id=1905
The question is which derivative should diff mean. If F is a
multivector function and grad is the derivative operator then
grad*F, F*grad, grad^F, F^grad, grad|F, F|grad, grad<F, F<grad, grad>F,
and F>grad are all different derivatives. In a
future revision it is more complicated since you would have an lgrad
(left gradient) and rgrad (right gradient) where
lgrad*F is a multivector, but F*lgrad is a differential operator then
F*rgrad is a multivector, rgrad*F is a differential operator.
For example F|lgrad is the directional derivative operator.
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