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        "quote": "连续应用 (Top2) 可知，任意有限个开集的交集是开集，但 $\\mathcal{O}$ 一般对开集的无限交集不封闭。另一方面，$\\mathcal{O}$ 对开集的任意并集封闭。二元组 $( X , { \\mathcal { O } } )$，其中 $\\mathcal{O}$ 是 $X$ 上的一个拓扑，称为一个 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:45a8647a-b930-455d-8207-7edbb089a132\" data-concept-route=\"/concept-identities#concept-45a8647a-b930-455d-8207-7edbb089a132\" id=\"first-dea640c66ed6d34a8246-zh\">拓扑空间(topological space)</u>。当拓扑 $\\mathcal{O}$ 已明确时，我们常常就直接说拓扑空间 $X$。底空间 $X$ 的元素通常称为点。",
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