Comment #5 on issue 2856 by [email protected]: limit(x**16/(x**16 + 1), x, oo) fails
http://code.google.com/p/sympy/issues/detail?id=2856
This ended up being a bit of a marathon repair, but such expressions work nicely (and quickly). A big thanks to @tsndiffopera who got this going, @sh72116 who made helpful suggestions through a patch for how the problem might be solve, @asmeurer and @raoulb who helped with comments, and @ness01 who persevered through the review proces until the end.
If you want just the leading term of an expression foo.as_leading_term(x) should work -- most of the time without having to compute the series. e.g. erf(x).as_leading_term(x) -> 2*x/sqrt(pi); cos(1/x + x).as_leading_term(x) -> cos(1/x); the series of the same would raise an error.
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