In fuzzy topological space, some sets are not closed sets, but they display some characteristics of clsed sets on some stratiform, if is so-called stratiform closed set.
在模糊拓扑空间中，有些集合本身并不是闭集，但在某些层次上它却表现出闭集的特性，这就是所谓的层次闭集。
In fuzzy topological space, some sets are not closed sets, but they display some characteristics of clsed sets on some stratiform, if is so-called stratiform closed set.
在模糊拓扑空间中，有些集合本身并不是闭集，但在某些层次上它却表现出闭集的特性，这就是所谓的层次闭集。
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