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.
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.
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