How exactly would one go about proving that(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \frac{1}{1-2^{1-z}}[/tex] has a simple pole at [tex]z=1[/tex]?

I've tried writing [tex]2^{1-z}[/tex] in terms of e to get a Taylor series for the denominator but can't quite figure out where to go from there.

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# Simple Pole

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