Small uncountable cardinals in large-scale topology
Logic
2021-10-19 v7 Combinatorics
Abstract
In this paper we are interested in finding and evaluating cardinal characteristics of the continuum that appear in large-scale topology, usually as the smallest weights of coarse structures that belong to certain classes (indiscrete, inseparated, large) of finitary or locally finite coarse structures on . Besides well-known cardinals we shall encounter two new cardinals and , defined as the smallest weight of a finitary coarse structure on which contains no discrete subspaces and no asymptotically separated sets, respectively. We prove that , but we do not know if the cardinals can be separated in suitable models of ZFC.
Keywords
Cite
@article{arxiv.2002.08800,
title = {Small uncountable cardinals in large-scale topology},
author = {Taras Banakh},
journal= {arXiv preprint arXiv:2002.08800},
year = {2021}
}
Comments
37 pages