第一章拓扑空间简介第七题的一句话证明版本 #5
weiyuanli314
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嗯谢谢，这个就先不改了，目前的任务还是将没做的题完善 |
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因为LCH是$T_3$ 空间，所以LCH中每点有一个闭邻域基，该闭邻域基与紧邻域取交集，即得到紧邻域基。
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