Comment #10 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 can emulate Maple's syntax for calling (D(f)(x)) and for the argument
(D[1]f(x, y)(x)), but the order is a little harder. Maple uses
(D@@2)(f)(x) to mean the second derivative of f evaluated at the point x.
I guess we should just do D(f, 2)(x).
Maple also has the syntax:
diff(f(2*x, y), x, x, y);
4 D[1, 1, 2](f)(2 x, y)
But it would probably be too restrictive if we only allowed the above.
Repeating indices can be a pain for very high order derivatives (which is
why I'm glad we have the diff(x, 10) syntax that Maple lacks).
There are also more advanced possibilities that we can do with a slice.
Any suggestions?
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