10. Let Ω⊆C be open and such thatA(0;r,∞)⊆Ω. Suppose thatf∈H(Ω). We say that∞isa removable singularity, pole of orderm∈N, or essential singularity offif 0 is the same for the functiong(z) =f(1/z) defined on Ω,={z∈C\{0}: 1/z∈Ω}. Iffis entire, classify the singularity offat∞by giving conditions on the power series offbased at 0. What are the only entire functionsfsuch that limz→∞f(z) =∞?
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