有界性的推广

Popularization of the Characteristic of Standard Limit

本文从函数的准有界性在几何意义上就是指函数的图像处于两平行线所确定的带形区域内这一特征出发,对函数的图像处于两相交直线所确定的扇形区域内的有界性作了介绍,并在此基础上对函数的有界性与界的定义做了推广。

In terms of geometrical meaning,the characteristic of standard limit is that its image lies in the belty area confirmed by two parallel lines.It introduces the characteristic of standard limit in the fan area confirmed by two unparallel lines.Based on that,this article popularizes the characteristic of limit and its definition.