许多经济系统中的优化问题，可化为用单值非线性算子或多值算子形成约束条件的条件极值问题。
All know that most of the optimization of economic system can be converted into conditional extreme value problem which takes nonlinear operator or multi operator as constraints.
对于非线性元件的输出为单值而输入有多值的情况，令输出为正弦信号，输入包含有各次谐波。
If the nonlinear element has a single output and multiple input values, the output signal is taken to be sinusoidal and the inputs contain harmonics.
本文对单值对称非线性特性的描述函数进行了分析，推导出了简化计算描述函数的方法(引理1、引理2、定理1)。
In this paper the describing function of single-valued symmetric nonlinear characteristics is analysed and simplify methods (Lemma 1. Lemma 2. Theorem 1) Dcaculating description function are proved.
本文对单值对称非线性特性的描述函数进行了分析，推导出了简化计算描述函数的方法(引理1、引理2、定理1)。
In this paper the describing function of single-valued symmetric nonlinear characteristics is analysed and simplify methods (Lemma 1. Lemma 2. Theorem 1) Dcaculating description function are proved.
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