Four Cardinals and Their Relations in ZF
Logic
2023-02-07 v2
Abstract
For a set , denotes the set of all finite subsets of , denotes the Cartesian product , denotes the set of all -element subsets of , and denotes the set of all finite sequences without repetition which can be formed with elements of . Furthermore, for a set , let denote the cardinality of . Under the assumption that the four cardinalities , , , are pairwise distinct and pairwise comparable in ZF, there are six possible linear orderings between these four cardinalities. We show that at least five of the six possible linear orderings are consistent with ZF.
Cite
@article{arxiv.2109.11315,
title = {Four Cardinals and Their Relations in ZF},
author = {Lorenz Halbeisen and Riccardo Plati and Salome Schumacher and Saharon Shelah},
journal= {arXiv preprint arXiv:2109.11315},
year = {2023}
}
Comments
19 pages, 1 figure