Discussion
An isolated singularity at which the Laurent expansion has infinitely many negative powers is called
Answer: C
A removable singularity has no negative powers, a pole of order \( m \) has finitely many down to \( (z - z_{0})^{-m} \), and an essential singularity has infinitely many. The standard example is \( e^{1/z} \) at the origin, near which the function takes every value infinitely often, so no limit exists in any sense
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