数列极限定义
江苏大学高等数学云教材
Disclaimer: This problem is designed for the Cloud Textbook of Advanced Mathematics of Jiangsu University.
主题:数列、极限 、输入、输出、函数、邻域、区间、不等式、定义域、值域
学习要求：1.探究1：拖动Y轴上L点，表示的大小，阅读下面操作指导。
2.探究2：请你分析数列极限的定义，并参与后续练习。
The limit of the sequence () is if given any , there is an 0 such that for all .
The yellow band is and the blue region correspons to those . The green dots are within of and the red dots and red x's are not. The limit is if for any given you are able to move the blue region far enough to the right that there are no red x's.
Note: 要移动窗口，按住shift键并拖动。要放大或缩小，请按住shift键并滚动鼠标。
练习：根据上述小程序，说说数列极限的几何意义。
下列说法正确的有：