Comment #16 on issue 2476 by [email protected]: nth order Derivative http://code.google.com/p/sympy/issues/detail?id=2476
It looks like what I said above is incomplete. We will have to extend _eval_derivative to accept an 'order' argument too.
I noticed that some functions define .fdiff() while others define _eval_derivative() and some define both. Maybe this is a good time to clean up a bit, since many things will have to change.
I think the best way would be to have only one of the above implemented by children, probably fdiff(). From what I saw up to now, Function._eval_derivative can handle everything if fdiff() is correctly implemented.
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