在拓扑空间中,闭集是指其补集为开集的集合。由此可以引申在度量空间中,如果一个集合所有的极限点都是这个集合中的点,那么这个集合是闭集。不要混淆于闭流形。
它们都是“好的推广”且对闭集遗传。
They are all "good extentions" and hereditary with closed LF sets.
层次闭集可以形成一种拓扑,称之为模糊层次拓扑。
They form a topology, and it is called fuzzy stratiform topology.
本文给出拓扑空间中半闭集概念,并讨论半闭集的有关性质。
This article gives us the idea of semi-closed in Topo - logical Spaces, and discusses the characters of the semi-closed.
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