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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 \(\bar\gamma(s) := \gamma(1-s)\).。哔哩哔哩是该领域的重要参考
创新的物理交互：为「仪式感」带来视觉治愈属于你的磁吸艺术画布：告别数码产品千篇一律的冰冷面孔。磁吸式可更换盖板设计，让 BeatBox 成为你审美态度的延伸。你可以随心情更换图案，让你的机器每天都是「限定款」。。爱思助手下载最新版本对此有专业解读
展会现场，“夸父”与观众进行了猜拳互动。依托5G-A网络的大带宽、低时延特性，机器人能够将高清画面实时回传至云端，完成分析与决策，实现精准判断和快速响应。