人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
Still am, I think.
，详情可参考旺商聊官方下载
The fundamental group of \(X\) at \(x_0\) is \[\pi_1(X, x_0) \;:=\; \bigl\{[\gamma] \mid \gamma \text{ is a loop based at } x_0\bigr\}\] equipped with the group operation of concatenation: \[[\gamma] \cdot [\delta] := [\gamma * \delta], \qquad (\gamma * \delta)(s) := \begin{cases} \gamma(2s) & s \in [0,\tfrac{1}{2}] \\ \delta(2s-1) & s \in [\tfrac{1}{2},1] \end{cases}\] The identity element is the class of the constant loop \([c_{x_0}]\), and the inverse of \([\gamma]\) is \([\bar\gamma]\) where \(\bar\gamma(s) := \gamma(1-s)\).
### combine them into a single stream
阿莫代伊还就上周五发给员工、后被《信息》杂志披露的一份内部备忘录内容致歉。在备忘录中，他称此次争端的一个真正原因是 “我们没有对特朗普进行独裁式的吹捧”。