Back Prinzip vom Argument German Principio del argumento Spanish Principe de l'argument French עקרון הארגומנט HE Argumentumelv Hungarian Principio dell'argomento Italian 偏角の原理 Japanese 편각 원리 Korean Principi dal argümeent LMO Принцип аргумента Russian

Argument principle

The simple contour C (black), the zeros of f (blue) and the poles of f (red). Here we have

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.

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