今年，大众将有超过20款新能源车型在中国上市。贝瑞德说，从陪伴中国汽车工业起步，到在新能源时代与中国伙伴同行，“我们始终坚持长期主义，更多成果还在路上——我乐于见证这些变革真正落地，看到大众在中国开启新的篇章。”
Josh Dury Photo-Media
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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 \(\bar\gamma(s) := \gamma(1-s)\).
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