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.
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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