预开集
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semi-pre-open sets 半预开集
fuzzy pre-open sets 模糊预开集
strong pre-open sets 强拟开集
fuzzy pre-semi-open sets 模糊预半开集
pre-open sets
pre-open集
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In this paper, strong pre-open and strong pre-close sets were introduced in topological spaces and their properties were researched.
在分明拓扑空间中引入强拟开集和强拟闭集的概念，并讨论了它们的性质。
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