Posted by haifeng on 2020-10-01 15:57:44 last update 2020-10-01 15:57:44 | Answers (1) | 收藏
证明: $\lim\limits_{n\rightarrow\infty}x_n=0$ 当且仅当 $\lim\limits_{n\rightarrow\infty}|x_n|=0$.
