Updates:
Status: Invalid
Comment #3 on issue 2290 by [email protected]: limit(O(x),x,0) fails
http://code.google.com/p/sympy/issues/detail?id=2290
According to git bisect, it was fixed by:
commit 828f8a58dc2015c482660a608b909325898a4eb5
Author: Chris Smith <[email protected]>
Date: Wed Jan 19 15:35:46 2011 +0545
2130: don't depend on subs in limit
2130 subs at discontinuity is NaN
power subs gives NaN if either base or exponent are NaN
or the substitution results in oo.
move find_limit's heuristic to limit
All the heuristics except the one for log terms was already
in limit so the log heuristic was moved to limit and find_limit
was eliminated.
What constitutes a PoleError was expanded a bit. Since subs will give
a NaN now it is (more?) likely that a NaN will be returned than a
signed infinity. Also even though arg0 might not be zero the function
evaluated at arg0 may be undefined (as tan(x+pi/2) at x=0) and so the
PoleError is raised there, too.
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