Comment #25 on issue 3128 by [email protected]: Sum and Product manipulations
http://code.google.com/p/sympy/issues/detail?id=3128

As I said, I agree that we need a way to represent summing over a set. The issue is that representing this is more computationally difficult, and may require different (less powerful) algorithms. Karr uses his convention specifically because it makes his algorithm possible. Raoul (hopefully) can explain this better.

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