English

Compactification of cut-point spaces

General Topology 2019-09-25 v1

Abstract

We show that if XX is a separable locally compact Hausdorff connected space with fewer than c\mathfrak c non-cut points, then XX embeds into a dendrite DR2D\subseteq \mathbb R ^2, and the set of non-cut points of XX is a nowhere dense GδG_\delta-set. We then prove a Tychonoff cut-point space XX is weakly orderable if and only if βX\beta X is an irreducible continuum. Finally, we show every separable metrizable cut-point space densely embeds into a reducible continuum with no cut points. By contrast, there is a Tychonoff cut-point space each of whose compactifications has the same cut point. The example raises some questions about persistent cut points in Tychonoff spaces.

Keywords

Cite

@article{arxiv.1909.10646,
  title  = {Compactification of cut-point spaces},
  author = {David S. Lipham},
  journal= {arXiv preprint arXiv:1909.10646},
  year   = {2019}
}

Comments

8 pages

R2 v1 2026-06-23T11:23:46.121Z