Comment #15 on issue 2476 by asmeurer: nth order Derivative http://code.google.com/p/sympy/issues/detail?id=2476
I'm referring mainlyt to functions that take in a number as input, not those that take some kind of list object.
For example, consider the function binary_partitions() from https://github.com/sympy/sympy/pull/412. This won't work if you do binary_partitions(Symbol('n')). But in order to implement the sort of thing we want here, we need exactly that sort of behavior for the combinatorics functions (given a Symbol, return a Set object; given a number, evaluate it).
By the way, don't think of a symbolic set as {a, b, c}. Think of it as {1, 2, ..., n}, where n is symbolic.
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