Cofinality of the nonstationary ideal
Logic
2013-01-03 v1
Abstract
We show that the reduced cofinality of the nonstationary ideal NS_kappa on a regular uncountable cardinal kappa may be less than its cofinality, where the reduced cofinality of NS_kappa is the least cardinality of any family F of nonstationary subsets of kappa such that every nonstationary subset of kappa can be covered by less than many members of F.
Cite
@article{arxiv.math/0210087,
title = {Cofinality of the nonstationary ideal},
author = {Pierre Matet and Andrzej Rosłanowski and Saharon Shelah},
journal= {arXiv preprint arXiv:math/0210087},
year = {2013}
}