Comment #6 on issue 2723 by [email protected]: What should summation() do with non-integer limits?
http://code.google.com/p/sympy/issues/detail?id=2723
Thanks for looking into this. I fully agree that it is not a big problem as the sum evaluates to the same values except at a = 0.
I looked in various math books for a definition of the sum and few explicitly state that the summation variables have to be integers. So it seems to me that the common convention is to use integers but it is not an absolute condition.
The counter example I am currently dealing with is "Principles of Magnetic Resonance" (Slichter, C.P., Springer) or most likely any other book dealing with similar physics. So while this definition might be a rare case it would be certainly useful if it works out of the box and I can't see any disadvantage for the regular case.
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