topological closure operator 拓扑闭包算子
neighborhood topological closure 邻域拓扑闭包
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Similar to the building of topological Spaces through the calculation of a closure of set, the topological Spaces can also be built through the derived set calculation.
又类似于从闭包运算出发建立拓扑空间，从而得到了从导集运算出发建立的拓扑空间。
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