Also known as closed subset
set whose complement is an open set
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Article · 中文
在拓扑空间中,闭集是指其补集为开集的集合。在一个拓扑空间内,闭集可以定义为一个包含所有其极限点的集合。在完备度量空间中,一个闭集的极限运算是闭合的。不要混淆于闭流形。
Abstract from DBpedia / Wikipedia · CC BY-SA