Status: Valid
Owner: julien.r...@gmail.com
Labels: Type-Defect Priority-Medium Concrete
New issue 3924 by julien.r...@gmail.com: Evaluation of nested sums.
http://code.google.com/p/sympy/issues/detail?id=3924
It would be nice to return even partial results when evaluating nested
sums. For example:
from sympy import init_session
init_session()
Sum(f(n)*Sum(KroneckerDelta(n, m), (m, 1, oo)), (n, 1, oo)).doit()
oo
_____
\ `
\ oo
\ ___
\ \ `
) f(n)* \ d
/ / m,n
/ /__,
/ m = 1
/____,
n = 1
The inner sum could be resolved.
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