Updates:
Labels: Series WrongResult
Comment #2 on issue 2811 by [email protected]: Make (1/(1 - t)).subs(t, 1)
return -oo instead of oo
http://code.google.com/p/sympy/issues/detail?id=2811
Actually, according to issue 2096, it should return zoo.
But to make it consistant with the current behavior, it should be -oo,
because we currently take the limit from the right. Actually, I'm not sure
if there's a good way to do this without using limit, which would be
another good reason to return zoo here.
By the way, limit() is actually wrong (assumedly because subs is wrong):
In [27]: limit(1/(1 - t), t, 1, dir="+")
Out[27]: ∞
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