Comment #10 on issue 2753 by [email protected]:
series(1/cos(x/log(x)),x,0,5) does not work
http://code.google.com/p/sympy/issues/detail?id=2753
I think I found at exactly where the problem is.
The given example uses _eval_nseries present in sympy/core/power.py
This function returns the series which can have coefficients containing
log(x) term.
So for this function, it is necessary that logx is defined and not None
So I fixed it, also removed the logx variable from actual output similar to
what I did before. Everything is fine except one testcase.
In that testcase, the big O term should be O(x**4*log(x)**4). However what
I get is O(x**4) because log(x) is replaced by a symbol which does not
count in big O notation.
I'm a bit lost on how to include the logx term in big O notation. I'll wait
for the author of logx option to clarify.
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