Comment #29 on issue 1116 by [email protected]: integrate outputs wrong
result when the function is singular
http://code.google.com/p/sympy/issues/detail?id=1116
Partly what makes it any sort of deal is that we don't have a predifined
function to establish the domain of a function. This could be done by
building the set of all solutions to the denominators of expression as a
start, and denoms() in solvers.py could be used to give the set of
denominators that appear:
>>> from sympy.solvers.solvers import denoms
>>> denoms((1 + 1/x)/(x - 1))
set([x - 1, x])
>>> d=_
>>> exclude=set()
>>> for di in d:
... exclude.update(solve(di))
...
>>> exclude
set([1, 0])
So 1 and 0 are excluded from the domain of the function.
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