The definition of derived set calculation can be obtained according to the closure of set and the characteristics of derived set.
根据导集的性质以及闭包运算的定义，得到导集运算的定义。
This paper defines the concept of derived set operator, introduces the concept of fuzzy derived set operator in EX, studies their properties and discusses their relations to topology.
文中给出了导集算子的概念，并在EX上引入了模糊导集算子的概念，研究了其性质，讨论了它们与拓扑间的关系。
This paper defines the concept of derived set operator, introduces the concept of fuzzy derived set operator in EX, studies their properties and discusses their relations to topology.
文中给出了导集算子的概念，并在EX上引入了模糊导集算子的概念，研究了其性质，讨论了它们与拓扑间的关系。
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