New Hindman spaces
Abstract
We introduce a method that allows to turn topological questions about Hindman spaces into purely combinatorial questions about the Kat\v{e}tov order of ideals on . We also provide two applications of the method. (1) We characterize ideals for which there is a Hindman space which is not an -space under the continuum hypothesis. This reduces a topological question of Albin L. Jones about consistency of existence of a Hindman space which is not van der Waerden to the question whether the ideal of all non AP-sets is not below the ideal of all non IP-sets in the Kat\v{e}tov order. (2) Under the continuum hypothesis, we construct a Hindman space which is not an -space. This answers a question posed by Jana Fla\v{s}kov\'{a} at the 22nd Summer Conference on Topology and its Applications.
Cite
@article{arxiv.2308.14396,
title = {New Hindman spaces},
author = {Rafał Filipów and Krzysztof Kowitz and Adam Kwela and Jacek Tryba},
journal= {arXiv preprint arXiv:2308.14396},
year = {2023}
}