Closed set - Heishuugou (English spelling) Closed set
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A subset N of a topological space S is said to be closed if the limit of the points of N is also in N. This is equivalent to saying that the complement of N is an open set. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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位相空間 Sの部分集合 Nは，Nの点の極限がまた Nに入るとき，閉集合であるといわれる。これは，Nの補集合が開集合であることと同値である。
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