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Related papers: Characterizing Corson and Valdivia compact spaces

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We prove some generalizations of results concerning Valdivia compact spaces (equivalently spaces with a commutative retractional skeleton) to the spaces with a retractional skeleton (not necessarily commutative). Namely, we show that the…

Functional Analysis · Mathematics 2014-01-30 Marek Cuth

We prove that a countably compact space is monotonically retractable if and only if it has a full retractional skeleton. In particular, a compact space is monotonically retractable if and only if it is Corson. This gives an answer to a…

General Topology · Mathematics 2014-11-07 Marek Cúth , Ondřej F. K. Kalenda

We investigate the class of continuous images of non-commutative Valdivia compact spaces, in particular its subclass of weakly non-commutative Cor- son countably compact spaces. A key tool is the study of non-commutative Corson countably…

General Topology · Mathematics 2016-03-14 Jacopo Somaglia

The aim of this note is to characterize trees, endowed with coarse wedge topology, that have a retractional skeleton. We use this characterization to provide new examples of non-commutative Valdivia compact spaces that are not Valdivia.

General Topology · Mathematics 2018-03-07 Jacopo Somaglia

It is know that the Valdivia compact spaces can be characterized by a special family of retractions called $r$-skeleton (see \cite{kubis1}). Also we know that there are compact spaces with $r$-skeletons which are not Valdivia. In this…

General Topology · Mathematics 2020-01-20 S. Garcia-Ferreira , C. Yescas Aparicio

We study linearly ordered spaces which are Valdivia compact in their order topology. We find an internal characterization of these spaces and we present a counter-example disproving a conjecture posed earlier by the first author. The…

General Topology · Mathematics 2012-10-23 Ondrej Kalenda , Wieslaw Kubis

We study compact spaces which are obtained from metric compacta by iterating the operation of inverse limit of continuous sequences of retractions. We denote this class by R. Allowing continuous images in the definition of class R, one…

General Topology · Mathematics 2012-10-23 Wieslaw Kubis

We deeply study retractions associated to suitable models in compact spaces admitting a retractional skeleton and find several interesting consequences. Most importantly, we provide a new characterization of Valdivia compacta using the…

General Topology · Mathematics 2022-02-03 Claudia Correa , Marek Cúth , Jacopo Somaglia

We characterize when the countable power of a Corson compactum has a dense metrizable subspace and construct consistent examples of Corson compacta whose countable power does not have a dense metrizable subspace. We also give several…

General Topology · Mathematics 2024-03-26 Arkady Leiderman , Santi Spadaro , Stevo Todorcevic

We introduce and study a new topology on trees, that we call the countably coarse wedge topology. Such a topology is strictly finer than the coarse wedge topology and it turns every chain complete, rooted tree into a Fr\'echet--Urysohn,…

General Topology · Mathematics 2022-03-16 Tommaso Russo , Jacopo Somaglia

We prove a preservation theorem for the class of Valdivia compact spaces, which involves inverse sequences of ``simple'' retractions. Consequently, a compact space of weight $\loe\aleph_1$ is Valdivia compact iff it is the limit of an…

General Topology · Mathematics 2012-10-23 Wieslaw Kubiś , Henryk Michalewski

We prove that a compact space is monotonically Sokolov if and only if it is monotonically $\omega$-monolithic. This gives answers to several questions of R. Rojas-Hernandez and V. V. Tkachuk.

General Topology · Mathematics 2014-11-26 Marek Cuth

We present a characterization of Valdivia compact spaces of small weight in terms of path spaces of trees and we use it to obtain (under $\diamondsuit$) a counterexample to a conjecture related to an open problem concerning twisted sums of…

General Topology · Mathematics 2016-07-26 Claudia Correa , Daniel V. Tausk

An $r$-skeleton on a compact space is a family of continuous retractions having certain rich properties. The $r$-skeletons have been used to characterized the Valdivia compact spaces and the Corson compact spaces. Here, we characterized a…

General Topology · Mathematics 2018-04-06 S. Garcia-Ferreira , C. Yescas-Aparicio

Let R denote the smallest class of compact spaces containing all metric compacta and closed under limits of continuous inverse sequences of retractions. Class R is striclty larger than the class of Valdivia compact spaces. We show that…

General Topology · Mathematics 2012-10-23 Wieslaw Kubiś

We investigate the class of compact spaces which are embeddable into a power of the real line $R^\kappa$ in such a way that c_0(\kappa) is dense in the image. We show that this is a proper subclass of the class of Valdivia, even when…

General Topology · Mathematics 2012-10-23 W. Kubiś , A. Leiderman

Given a compact space in a fixed universe of set theory, one can naturally define its interpretation in any ZFC extension of the universe. We investigate the stability of some classes of compact spaces with respect to extensions of this…

General Topology · Mathematics 2014-02-10 Wiesław Kubiś

A compact space $K$ is {\em Valdivia compact} if it can be embedded in a Tikhonov cube $I^A$ in such a way that the intersection $K\cap\Sigma$ is dense in $K$, where $\Sigma$ is the sigma-product (= the set of points with countably many…

General Topology · Mathematics 2012-10-23 Wieslaw Kubiś , Vladimir Uspenskij

In this article, we mainly study certain families of continuous retractions ($r$-skeletons) having certain rich properties. By using monotonically retractable spaces we solve a question posed by R. Z. Buzyakova in \cite{buz} concerning the…

General Topology · Mathematics 2015-08-04 S. Garcia-Ferreira , R. Rojas-Hernandez

A convex subset X of a linear topological space is called compactly convex if there is a continuous compact-valued map $\Phi:X\to exp(X)$ such that $[x,y]\subset\Phi(x)\cup \Phi(y)$ for all $x,y\in X$. We prove that each convex subset of…

Functional Analysis · Mathematics 2012-12-19 T. Banakh , M. Mitrofanov , O. Ravsky
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