问题

局部闭子集(locally closed subset)

根据 Bourbaki[1], 拓扑空间 $(X,\tau)$ 的一个子集 $S$ 被称为局部闭的, 如果它是一个开集和一个闭集的交.

[2]: According to Bourbaki [1] a subset S of a space $(X,\tau)$ is called locally closed if it is the intersection of an open set and a closed set.

References:

[1] N. Bourbaki, General Topology Part 1, Addison Wesley, Reading, Mass. 1966.

[2] http://www.math.tugraz.at/~ganster/papers/33.pdf