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Comment #9 on issue 1620 by asmeurer: Allow derivatives of unknown
functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
I thought I had already posted this here, but I guess it got lost.
The pprint thing from comment 2 is something else (I didn't understand the
Maple command very well). eval() is a kind of unevaluated subs(). What we
need here is actually just the D operator that I described in comment 7,
which would be printed almost exactly like it is entered (maybe the order n
should be printed as a superscript, but that's it). If you think eval()
would be useful, then we can create one and print it like that. But it
would be a different issue.
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