Cofinality of the nonstationary ideal

Details Cofinality of the nonstationary ideal Cofinality of the nonstationary ideal

2002-10-06

arxiv.org/abs/math/0210087v1

Mathematics

Logic

Scientific paper

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.

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