Definition 4 (Definition: Fundamental Group) Let \(X\) be a topological space and \(x_0 \in X\) a basepoint. A loop based at \(x_0\) is a continuous map \(\gamma: [0,1] \to X\) with \(\gamma(0) = \gamma(1) = x_0\). Two loops \(\gamma, \delta\) are homotopic relative to \(x_0\) (written \(\gamma \simeq \delta\)) if there exists a continuous map \(H: [0,1] \times [0,1] \to X\) such that \[H(s,0) = \gamma(s), \quad H(s,1) = \delta(s), \quad H(0,t) = H(1,t) = x_0\] for all \(s,t \in [0,1]\). This is an equivalence relation; denote the equivalence class of \(\gamma\) by \([\gamma]\).
根据财报数据，零跑的整车自研自造比例达到了 65%，包括了车灯、座椅、油泵、甚至内饰的树脂配件。零跑共计拥有 17 个零部件工厂，这让 A10 在定价时拥有了极高的自由度。省去了中间商的差价，这些被挤出来的利润空间，最终变成了车顶的那颗激光雷达，变成了座舱里的 12 个扬声器。
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If you live in an apartment, dorm, or a duplex, you probably have set quiet hours. Ignoring these can come with angry neighbors or warnings from the landlord. But it's not always easy on Saturday night when belting out Britney Spears karaoke songs to keep track of the time. Instead of getting a knock on your door at 11 p.m., set your speaker or the TV to automatically lower the volume at a set time. Your party will automatically get the memo that it's time to wind down.
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