Comment #3 on issue 2703 by skirpic...@gmail.com: summation(z**n, (n, 1,
oo)) gives a strange result
http://code.google.com/p/sympy/issues/detail?id=2703
I think, this is fixed in PR 1910, e.g.:
In [3]: summation(z**n, (n, 1, oo))
Out[3]:
⎧ z
⎪ ────── for │z│ < 1
⎪ -z + 1
⎪
⎪ ∞
⎪ ___
⎨ ╲
⎪ ╲ n
⎪ ╱ z otherwise
⎪ ╱
⎪ ‾‾‾
⎪n = 1
⎩
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