: Astronomie: poles and zeros

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poles and zeros

In complex analysis (a branch of mathematics), a pole is a certain type of singularity of a function, nearby which the function behaves relatively regularly, in contrast to essential singularities, such as 0 for the logarithm function, and branch points, such as 0 for the complex square root function. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Zeros_and_poles)

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