Issue 1139: Description and Differentiation of vector, tensor, and  
multivector fields.
http://code.google.com/p/sympy/issues/detail?id=1139

Comment #9 by ondrej.certik:
Right, that's true.

But it has payed off to learn how they do things, so that we don't have to  
reinvent
the whole wheel. Good source of documentation+examples is here:

http://reference.wolfram.com



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