• 1. relative closed set: 相对闭集
• 2. relative semi-open semi-closed set: 相对半开集

• 1.Locany S-Closed Space is extremally disconnected if and only if every semi-regular S-closed set relative to X is Closed set.
  本注记给出局部S-闭空间X是极不连通的充要条件是X中每个相对X是S-闭的半正则于集是闭集。
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