调用一些自定义的数学函数。
微积分研究的对象是函数，研究工具是极限，微积分概念的定义方式与以往学习的初等数学概念有本质的区别。
Functions are research objects of the calculus and limit is its research tool. The way to define the calculus concept differs distinctly from that of elementary mathematics.
由于增量式函数观测器的数学定义是建立在非线性受控系统的基础上，因此，观测器的应用便可扩展到非线性控制领域。
With mathematical definition of increment function observer is based on nonlinear controlled system, so application of observer can be able to extend nonlinear control field.
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