Hello,
I submitted a pull request for the problem you observed:
https://github.com/sympy/sympy/pull/1261
Once this is in, the particular sum (and some related ones) should work.
On 25.04.2012 00:07, Kjetil brinchmann Halvorsen wrote:
I found the usefull summation function, which seems to work well
(examples from todays version from git)
In [30]: summation(1/k**2,(k,1,oo))
Out[30]:
2
π
──
6
In [31]: summation( (-1)**k * binomial(n,k), (k,0,n))
Out[31]: 0
But:
In [32]: summation( binomial(n,k), (k,0,n))
Out[32]:
n
____
╲
╲ ⎛n⎞
╲ ⎜ ⎟
╱ ⎝k⎠
╱
╱
‾‾‾‾
k = 0
Which should be possible to do!
(I think sage can do that one)
Kjetil
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