Usuba's principle $UB_\lambda$ can fail at singular cardinals
Logic
2023-10-27 v4
Abstract
We answer a question of Usuba by showing that the combinatorial principle can fail at a singular cardinal. Furthermore, can be taken to be
Cite
@article{arxiv.2107.09339,
title = {Usuba's principle $UB_\lambda$ can fail at singular cardinals},
author = {Mohammad Golshani and Saharon Shelah},
journal= {arXiv preprint arXiv:2107.09339},
year = {2023}
}
Comments
Paper number 1216 second author. Accepted for Journal of Symbolic Logic