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Root / 維基大典 / clean / 稠密 / 稠密.txt
Work: 稠密
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Metadata
- Work ID
- 92553
- Document ID
- 259848
- Title
- 稠密
- Corpus root
- 維基大典
- Page title
- 稠密
- File
- 稠密.txt
- Path
- 維基大典/clean/稠密/稠密.txt
Punctuation options
稠密者,盈天下也。
定義
拓撲空間之子集曰稠密者,其閉包為空間也。
例
空間,稠密也。
分數集及無理數集,稠密于實數集也。
度量空間,稠密于其完備也。
見
無處稠密
拓撲術語
拓撲
子空間
積空間
商空間
拓撲分類
點
內
外
極限點
孤點
周界
曲線
道路
開集
閉集
閉包
閉開集
分離
稠密
度量
距
有界
鄰域
覆蓋
緊集
連通
道路連通
單連通
局部
基
準基
連續
開函數
閉函數
同胚
同倫
拓撲不變量