Comment #9 on issue 3128 by thilina....@gmail.com: Sum and Product
manipulations
http://code.google.com/p/sympy/issues/detail?id=3128
I am still having a few problems regarding this. Let's consider, Sum(2*n,
(n, 1, 9)). then changing index n -> 2*n gives Sum(4*n, (n, 0.5, 4.5))
where new n should be incremented by 0.5. But in Sum variables are
incremented by 1. So the above Sums evaluate to different values. It would
be a big help if you can clarify this a little more.
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