Coincidence of the upper Vietoris topology and the Scott topology

Coincidence of the upper Vietoris topology and the Scott topology
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上 Vietoris 拓扑与 Scott 拓扑的重合

DOI:
10.1016/j.topol.2020.107480
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发表时间:
2020-03
影响因子:
0.6
通讯作者:
Zhongqiang Yang
Zhongqiang Yang
中科院分区:
数学4区
文献类型:
--
作者:
Xu Xiaoquan;Zhongqiang Yang

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对T0空间X,设K(X)是X的所有非空紧饱和集的偏序集,其包含序是反的。称空间X具有性质Q,如果对任意K1,K2 ∈ K(X),K1 K2在K(X)中当且仅当K2 ≠ K1。本文给出了X的良滤性、X的纯性、X的局部紧性、X的核紧性、X的性质Q、K(X)上的Vietoris拓扑与Scott拓扑的重合性以及x → ↑x:X −→ → K(X)(其中K(X)是K(X)的Scott空间)的连续性之间的若干联系。本文证明了:对于Smyth幂空间PS(X)是一次可数的良滤空间X,X的局部紧性、X的核紧性和K(X)的连续性是等价的.本文还证明了:对于一个第一可数的T_0空间X,如果K的极小元集对于X的任一紧饱和子集K都是可数的,则Smyth幂空间PS(X)是第一可数的。对于具有Hausdorff性质且一次可数的Alexandroff双圈Y,我们证明了它的Smyth幂空间PS(Y)不是一次可数的。
For a T0 space X, let K(X) be the poset of all non-empty compact saturated sets.of X with the reverse inclusion order. The space X is said to have property Q if.for any K1, K2 ∈ K(X), K1 K2 in K(X) iff K2 ⊆ int K1. In this paper, we give.several connections among the well-filteredness of X, the sobriety of X, the local.compactness of X, the core compactness of X, the property Q of X, the coincidence.of the upper Vietoris topology and Scott topology on K(X), and the continuity of.x → ↑x : X −→ ΣK(X) (where ΣK(X) is the Scott space of K(X)). It is shown that.for a well-filtered space X for which its Smyth power space PS(X) is first-countable,.the following three properties are equivalent: the local compactness of X, the core.compactness of X and the continuity of K(X). It is also proved that for a firstcountable T0 space X in which the set of minimal elements of K is countable for any.compact saturated subset K of X, the Smyth power space PS(X) is first-countable..For the Alexandroff double circle Y , which is Hausdorff and first-countable, we show.that its Smyth power space PS(Y ) is not first-countable.
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