# The Argument Principle

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The argument principle in complex analysis states that for a meromorphic nonconstant function on an open subset and a closed curve bounding a compact subset inside , we have

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Contributed by: Andrzej Kozlowski (March 2011)

Open content licensed under CC BY-NC-SA

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Reference

[1] E. C. Titchmarch, *The Theory of Functions*, London: Oxford University Press, 1952.

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