Comment #7 on issue 2085 by asmeurer: Limit code severely broken. http://code.google.com/p/sympy/issues/detail?id=2085
@Quadricode: Well, I have a very limited knowledge of how the limit algorithm works, but if it is anything like the integration algorithm, it works recursively, reducing the problem to smaller problems of the same type. In that case, you solve problems with the larger problem by making it solve the smaller problem correctly. (Ondrej, can you verify of repute this claim?).
And I didn't actually mean that we should special case 1/x (though it might not be a bad idea, since it seems to be quite common). What I meant is that we need to figure out why it doesn't work properly and fix that. Nonetheless, the very fact that there is a heuristics function indicates that this sort of thing is already happening in the code.
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