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 \(\bar\gamma(s) := \gamma(1-s)\).
"He carries the load of home and family life. It still probably raises an eyebrow when he's called into a meeting and he says it has to be between 10am and 3pm. They'll be shocked that a man has said that," says Begg.
第二百一十八条 经证明，引起赔偿请求的损失是因责任人的故意或者明知可能造成损失而轻率地作为或者不作为造成的，该责任人无权依照本章规定限制赔偿责任。，详情可参考体育直播
A Cypriot government spokesperson has just confirmed that two unmanned drones headed to RAF Akrotiri were intercepted before reaching the base.。业内人士推荐WPS下载最新地址作为进阶阅读
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Percentile 99.9: 1116.276 ms | 942.41 ms，详情可参考WPS下载最新地址