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The shore point existence problem is equivalent to the non-block point existence problem

机译:岸点存在问题等同于非阻塞点存在问题

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We prove the three propositions are equivalent: (a) Every Hausdorff continuum has two or more shore points. (b) Every Hausdorff continuum has two or more non-block points. (c) Every Hausdorff continuum is coastal at each point. Thus it is consistent that all three properties fail. We also give the following characterization of shore points: The point p of the continuum X is a shore point if and only if there is a net of subcontinua in {K is an element of C(X) : K subset of kappa(p) - p} tending to X in the Vietoris topology. This contrasts with the standard characterization which only demands the net elements be contained in X p. In addition we prove every point of an indecomposable continuum is a shore point. (C) 2019 Elsevier B.V. All rights reserved.
机译:我们证明这三个命题是等价的:(a)每个Hausdorff连续体都有两个或多个支撑点。 (b)每个Hausdorff连续体都有两个或多个非阻塞点。 (c)每个Hausdorff连续体在每个点都是沿海的。因此,这三个属性均失败是一致的。我们还对海岸点进行以下表征:当且仅当{K中有一个连续子网络时,连续体X的点p是海岸点,C才是C(X)的元素:kappa(p)的K个子集-p}在Vietoris拓扑中趋于X。这与仅要求网元包含在X p中的标准表征相反。此外,我们证明了不可分解的连续体的每个点都是支撑点。 (C)2019 Elsevier B.V.保留所有权利。

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