| 7集的特征 |
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| 引用本文： | 邹励农. 7集的特征[J]. 北京工商大学学报(自然科学版), 1992, 0(2) |
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| 作者姓名： | 邹励农 |
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| 作者单位： | 北京轻工业学院数学教研室 |
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| 摘 要： | 本文主要研究了在度量空个E中,对任意一子集A,?、A、A_-、α(A)、β(A)、α(?)、β(A_-)全不相等的充分必要条件;进而究了在拓扑空间中,任意一子集A是Kuratowski——14集的充分必要条件.
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| 关 键 词： | 度量空间 拓扑空间 连通空问 Kuratowski——14集 |
CHARACTERIJATION OF 7-SETS |
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| Zou Linong Beijing Institute of Light Industry. CHARACTERIJATION OF 7-SETS[J]. Journal of Beijing Technology and Business University:Natural Science Edition, 1992, 0(2) |
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| Authors: | Zou Linong Beijing Institute of Light Industry |
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| Affiliation: | Zou Linong Beijing Institute of Light Industry |
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| Abstract: | Suppoe E is a meltric space and A is a subset of E, in this paper the uecessary and sufficient condition that subset A, A°、A、A~-、α(A)、β(A)α(A°)、and β(A~-) are all different is given. In addition, the condition for a subset A of a topological space S to produce Kuratowski-14 sets is also given. |
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| Keywords: | meltric space topological space Conected space Kuratowski-14 sets |
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