Comment #4 on issue 2641 by ness...@googlemail.com: limit() heuristics are wrong
http://code.google.com/p/sympy/issues/detail?id=2641
I think the idea [I did not write the code, of course] is that limit() does all sorts of stuff which is sometimes invalid (for speed), and recognises when things go wrong by looking for NaNs. I'm not convinced a lot of thought has gone into making this always correct (maybe there has).
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