Argument principle

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Notion

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Science and technology

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What Wikipedia says

In complex analysis, the argument principle (or Cauchy's argument principle) is a theorem relating the difference between the number of zeros and poles of a meromorphic function to a contour integral of the function's logarithmic derivative.

Excerpt from the Wikipedia article “Argument principle”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Archibald, Public domain, via Wikimedia Commons.