Rouché's Theorem is a fundamental result in complex analysis that provides a criterion for determining the number of zeros of holomorphic functions within a certain contour. The theorem states that if two holomorphic functions are defined on a simply connected domain and one dominates the other on the boundary of that domain, then both functions have the same number of zeros inside that domain. This concept is crucial when analyzing singularities and understanding the behavior of meromorphic functions.
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