我不是一开始就要介绍函数式编程的所有相关主题，而是关注几个关键概念，以及这些概念所产生的有趣的影响。
Rather than try to tackle the entire subject of functional programming out of the gate, I'll focus on several key concepts and follow some interesting implications derived from those concepts.
它利用了不定导纳矩阵的概念，在符号网络函数的产生中应用了代数法与符号编码相结合的方法。
It is based on the concept of indefinite admittance matrix, and USES an algebraic method of symbolic code in the generation of symbolic network functions.
由无限接近的思想产生出来的数学概念，主要用于研究函数在接近它们没有定义的点的过程中的行为。
Mathematical concept based on the idea of closeness, used mainly in studying the behaviour of functions close to values at which they are undefined.
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