请问,空间一维单连通怎么理解?为什么环面所围成的区域是空间二维单连通,但不是空间一维单连通? 知乎 Template




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tomski请问,空间一维单连通怎么理解?为什么环面所围成的区域是空间二维单连通,但不是空间一维单连通? 知乎 coloring