English

Spaces of Remote Points

General Topology 2018-09-19 v1

Abstract

Given a Tychonoff space XX, let ϱ(X)\varrho(X) be the set of remote points of XX. We view ϱ(X)\varrho(X) as a topological space. In this paper we assume that XX is metrizable and ask for conditions on YY so that ϱ(X)\varrho(X) is homeomorphic to ϱ(Y)\varrho(Y). This question has been studied before by R. G. Woods and C. Gates. We give some results of the following type: if XX has topological property P\mathbf{P} and ϱ(X)\varrho(X) is homeomorphic to ϱ(Y)\varrho(Y), then YY also has P\mathbf{P}. We also characterize the remote points of the rationals and irrationals up to some restrictions. Further, we show that ϱ(X)\varrho(X) and ϱ(Y)\varrho(Y) have open dense homeomorphic subspaces if XX and YY are both nowhere locally compact, completely metrizable and share the same cellular type, a cardinal invariant we define.

Keywords

Cite

@article{arxiv.1809.06813,
  title  = {Spaces of Remote Points},
  author = {Rodrigo Hernández-Gutiérrez and Michael Hrušák and Angel Tamariz-Mascarúa},
  journal= {arXiv preprint arXiv:1809.06813},
  year   = {2018}
}
R2 v1 2026-06-23T04:10:24.556Z