REMARKS ON δ-SEMI-OPEN SETS AND δ-PREOPEN SETS

REMARKS ON δ-SEMI-OPEN SETS AND δ-PREOPEN SETS
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关于δ-半开集和δ-预开集的备注

DOI:
10.1515/dema-2003-0424
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发表时间:
2003
期刊:
影响因子:
--
通讯作者:
T. Noiri
T. Noiri
中科院分区:
--
文献类型:
--
作者:
T. Noiri

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证明了拓扑空间(X,r)的子集A是<$-半开的(分别为5-预开)在(X,T)中当且仅当它是半开的(分别为preopen)在(X,T3)中,其中TS表示r的半正则化。利用这一事实,我们可以得到s-闭空间、半连通空间的几个新的刻画,以及一些分离性公理。
It is shown that a subset A of a topological space ( X , r ) is ¿-semi-open (resp. 5-preopen) in {X,T) if and only if it is semi-open (resp. preopen) in (X, T3), where TS denotes the semi-regularization of r . By using this fact, we can obtain several new characterizations of s-closed spaces, semi-connected spaces, and some separation axioms.