English

Connectivity degrees of complements of closed sets in continua

General Topology 2024-03-26 v1

Abstract

In the literature, various types of points and meager sets whose complements are connected have been studied, such as colocally connected points, non-weak cut points/sets, non-block points/sets, shore points/sets, etc. We extend that study, in the following way: considering a continuum XX and a natural number nn, we investigate sets A2XA \in 2^X meeting the criterion that XAX - A has at most nn components, and we introduce degrees of connectivity of the complement of AA. When n=1n=1 and AA is meager or singleton, these new definitions are equivalent to the known definitions of non-cut points/sets.

Keywords

Cite

@article{arxiv.2403.15595,
  title  = {Connectivity degrees of complements of closed sets in continua},
  author = {Mauricio Chacón-Tirado and César Piceno},
  journal= {arXiv preprint arXiv:2403.15595},
  year   = {2024}
}