A friendly iteration forcing that the four cardinal characteristics of $\mathcal{E}$ can be pairwise different
Logic
2022-06-30 v1
Abstract
Let be the -ideal generated by the closed measure zero sets of reals. We use an ultrafilter-extendable matrix iteration of ccc posets to force that, for , their associated cardinal characteristics (i.e.\ additivity, covering, uniformity and cofinality) are pairwise different.
Keywords
Cite
@article{arxiv.2206.14703,
title = {A friendly iteration forcing that the four cardinal characteristics of $\mathcal{E}$ can be pairwise different},
author = {Miguel A. Cardona},
journal= {arXiv preprint arXiv:2206.14703},
year = {2022}
}
Comments
28 pages, 8 figures. Submitted