Firstly, the definitions of complex quasi-random variable and primary norm are introduced.
引入复拟(概率)随机变量，准范数的定义。
DC Variable AC, quasi-sine wave. Automatic protection, safe and reliable. Small size, light weight and high efficiency. Pollution-free, maintenance-free, easy to use.
直流变交流，准正弦波。全自动保护，安全可靠。体积小，重量轻，效率高。无污染，免维护，使用方便。
The design of variable structure control for discrete time systems is discussed. The concepts of discrete time systems are told in detail, including quasi-sliding mode and quasi-sliding sector.
研究了离散变结构控制问题，详细叙述了离散时间系统的准滑模、理想滑模、非理想滑模与准滑模带的概念；
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