Comment #37 on issue 1620 by asmeurer: Allow derivatives of unknown
functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
We should definitely move over to issue 2476 style syntax.
I didn't think about using slices. That is a good idea. We could also
make it work with tuples, to be consistant with the proposed issue 2476
syntax, like D[(1, 2), 3, 2]. This is all syntactic sugar, so I actually
don't see any problems with allowing both. Of course, internally, it
should all be sanitized to the same format.
The function argument numbering is problematic. Do you know if there is
other precedent for numbering the function arguments starting at 1 other
than fdiff?
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