Variation function, which is the core and a basic tool of geostatistics, can describe not only the spatial structure change, but also the randomicity change of the regional variable.
变异函数是地质统计学的核心内容和基本工具，它既能描述区域化变量的空间结构性变化，又能描述其随机性变化。
It is introduced the basic concept, mathematical expression and design problems of the variable structure system and the application of AC motor speed adjustment system.
介绍变结构系统的基本概念、数学表达设计问题及其在交流电机调速系统中的应用。
The idea and basic problem in variable structure control, differential geometry method on feedback linearization , inverse system method, direct feedback linearization method are mainly described.
主要介绍了变结构控制、反馈线性化的微分几何方法、逆系统方法、直接反馈线性化等方法的基本思想和基本问题。
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