### Cofinality of the nonstationary ideal

by Matet and Roslanowski and Shelah. [MRSh:799]

Transactions American Math Soc, 2005

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 .

Back to the list of publications