Derivative of a Higher-Order Function
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        Published on 2008-11-26T15:18:58Z
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This is in the context of Automatic Differentiation - what would such a system do with a function like map, or filter - or even one of the SKI Combinators?
Example: I have the following function:
def func(x):
    return sum(map(lambda a: a**x, range(20)))
What would its derivative be? What will an AD system yield as a result? (This function is well-defined on real-number inputs).
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