开集 meaning in English

open set

it constitutes a presheaf of ring on the basis of open sets. (xf)fa .
这构成了开集基（Xf）fA上的环的予层。
Some annotations on l - fuzzy semiopen set
半开集的一点注记
Strongly pre - open sets and strong pre - continuity in l - topological spaces
拓扑空间中的强准开集与强准连续
The strong semi - open sets and weakly mapping in l smooth topological spaces
光滑拓扑空间中的强半开集强半闭集
Generalized topological skkm theorem related to an admissible multifunction on g - convex spaces
拓扑空间中的强拟开集

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