Comment #12 on issue 2723 by [email protected]: What should summation()
do with non-integer limits?
http://code.google.com/p/sympy/issues/detail?id=2723
We should allow non integer summation, just like Mathematica does (assuming
it does what a physicist would intuitively expect, which I think it does).
I think that the restriction "b-a is integer" is a sound one. Why not to
use the following identity at the beginning of summation:
summation(f(k), (k, a, b)) == summation(f(l+a), (l, 0, b-a))
where l = k-a, and simply check, that the upper limit "b-a" is an integer,
and then just call the old code?
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