Sh:799

• Matet, P., Rosłanowski, A., & Shelah, S. (2005). Cofinality of the nonstationary ideal. Trans. Amer. Math. Soc., 357(12), 4813–4837. arXiv: math/0210087 DOI: 10.1090/S0002-9947-05-04007-9 MR: 2165389
• 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 $\kappa$ many members of $F$.
• Version 2005-02-28_11 (25p) published version (25p)

@article{Sh:799,
 author = {Matet, Pierre and Ros{\l}anowski, Andrzej and Shelah, Saharon},
 title = {{Cofinality of the nonstationary ideal}},
 journal = {Trans. Amer. Math. Soc.},
 fjournal = {Transactions of the American Mathematical Society},
 volume = {357},
 number = {12},
 year = {2005},
 pages = {4813--4837},
 issn = {0002-9947},
 mrnumber = {2165389},
 mrclass = {03E35 (03E05)},
 doi = {10.1090/S0002-9947-05-04007-9},
 note = {\href{https://arxiv.org/abs/math/0210087}{arXiv: math/0210087}},
 arxiv_number = {math/0210087}
}