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 and be the hyperspaces of subcontinua and the one-point sets of X, respectively. Let be the collection of all regular subsets in X belonging to and let 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: , , and . We show that for hereditarily locally connected continua these equalities and the property of not contain a continuum called dendrite are equivalent each other. In the second part, we consider a continuum X for which there exists a continuous surjective and monotone function . We show that the conditions that X is a λ-type continuum and every t in is a cohesion point are equivalent to the equalities and . 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 和 分别是次连续的超空间和X的单点集。让是X 中属于的所有正则子集的集合 然后让 是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:, , 和 . 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X. 我们证明了X是λ型连续体的条件,并且每个t在 是一个内聚点 等价于等式 和 . 在整篇论文中,我们提出了开放性问题。