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.

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。

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Of the problems of optimal control, the most important two optimization methods are Pontryagin minimum(or called maximum) principle and Bellman dynamic programming.

在最优控制中，最重要的两种优化方法是庞特里亚金最小值（或称最大值） 原理和贝尔曼动态规划法。

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This principle, which is an extension of the principle that the maximum synthetic working stress is minimum, shows that the elastic working range of the bowl is maximum.

该条件表示转鼓在工作时弹性工作范围最大，它是最大合成工作应力最小原则的一个推广。

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