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Hyperspaces through regular and meager subcontinua
Topology and its Applications ( IF 0.6 ) Pub Date : 2021-06-24 , DOI: 10.1016/j.topol.2021.107760
Norberto Ordoñez

Given a metric continuum X, let C(X) and F1(X) be the hyperspaces of subcontinua and the one-point sets of X, respectively. Let D(X) be the collection of all regular subsets in X belonging to C(X) and let M(X) be all the subcontinua of X with empty interior. In the first part of this paper we are interested in the problem to classify continua that satisfies one of the following equalities: F1(X)=M(X), D(X)=D(X)F1(X), D(X)=C(X)M(X) and C(X)=D(X)M(X). We show that for hereditarily locally connected continua these equalities and the property of not contain a continuum called dendrite D1 are equivalent each other. In the second part, we consider a continuum X for which there exists a continuous surjective and monotone function f:X[0,1]. We show that the conditions that X is a λ-type continuum and every t in [0,1] is a cohesion point are equivalent to the equalities D(X)={AC(X):f(A)D([0,1])} and M(X)={AC(X):f(A)M([0,1])}. Throughout this paper we pose open problems.



中文翻译:

超空间通过常规和微薄的子连续体

给定一个度量连续统X,让C(X)F1(X)分别是次连续的超空间和X的单点集。让D(X)X 中属于的所有正则子集的集合C(X) 然后让 (X)X 的所有子连续体,内部为空。在本文的第一部分中,我们对满足以下等式之一的连续体进行分类的问题感兴趣:F1(X)=(X), D(X)=D(X)-F1(X), D(X)=C(X)-(X)C(X)=D(X)(X). 我们表明,对于遗传局部连接的连续体,这些等式和不包含称为树突的连续体的性质D1彼此等价。在第二部分,我们考虑存在连续满射单调函数的连续统XFX[0,1]. 我们证明了Xλ型连续体的条件,并且每个t[0,1] 是一个内聚点 等价于等式 D(X)={一种C(X)F(一种)D([0,1])}(X)={一种C(X)F(一种)([0,1])}. 在整篇论文中,我们提出了开放性问题。

更新日期:2021-07-02
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