Linear and nonlinear oscillations, relaxation.

线性及非线性振动，松弛。

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In the second part, we mainly consider oscillations of solution of some linear and nonlinear partial difference equations with discrete variables and delays.

第二章主要是研究某些类型的线性或非线性的带有离散时滞的偏差分方程解的振动性的判别法。

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Modeling an inverted pendulum. Generally the inverted pendulum system is modeled as a linear system, and hence the modeling is valid only for small oscillations of the pendulum.

为倒立摆建模。通常倒立摆系统建模成一个线形系统，因此模型只对小幅度摆动的摆才有效。

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