Poles of expression or function
Ifpoles
cannot find all nonremovable singularities and cannot prove that they do not exist, it issues a warning and returns an empty symbolic object.
Ifpoles
can prove that the input does not have poles (in the specified interval or complex plane), it returns empty without issuing a warning.
a
andb
must be real numbers or infinities. If you provide complex numbers,poles
uses an empty interval and returns an empty symbolic object.