Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium Series
New issue 2641 by [email protected]: limit() heuristics are wrong
http://code.google.com/p/sympy/issues/detail?id=2641
In [10]: limit(log(x)/z - log(2*x)/z, x, 0)
Out[10]:
2⋅zoo
─────
z
In [11]: gruntz(log(x)/z - log(2*x)/z, x, 0)
Out[11]:
-log(2)
───────
z
Basically zoo/z + zoo/z is turned into 2*zoo/z instead of nan, and then
limit() does not recognise that it should call gruntz.
So either somehow zoo/z + zoo/z has to become nan, or limit() must be
prepared to recognise such situations (my guess is the latter).
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