Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium

New 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

As noted in issue 1993, we currently have:

In [41]: (1/(1 - t)).subs(t, 1)
Out[41]: ∞

which leads to

n=t
d=t-1
(n/d).subs(t,1)
oo
(-n/-d).subs(t,1)
-oo

I think the solution is to make (1/(1 - t)).subs(t, 1) return -oo.

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