首先研究了辐角函数的一些性质，进而对对数函数的多值性进行了分析，最后讨论了多值函数的应用问题。

We firstly discuss the properties of the argument function and the single-valued analytical branch of logarithmic function.

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您可以使用函数abs和arg获得绝对值和辐角。

You can use the functions abs and arg to obtain the absolute value and the argument.

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从复变函数理论出发，利用辐角原理、最大模原理、最小模原理给出代数学基本定理的几种新的证明方法。

This paper uses several methods of complex functions theorey to prove fundamental theorem of algebra by argument principle, maximum modulus principle and minimum modulus principle.

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