Фото: Sergey Elagin / Business Online / Globallookpress.com
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 \(\bar\gamma(s) := \gamma(1-s)\).，推荐阅读体育直播获取更多信息
pixels checkpoint create base --label ready。体育直播对此有专业解读
第二条 县级以上人民政府依法对本级人民政府所属部门、派出机关和下级人民政府以及法律法规授权的具有管理公共事务职能的组织的行政执法工作开展的行政系统内部监督，适用本条例。