Towers and clubs

DOI10.1007/S00153-020-00754-3arXiv1908.05336MaRDI QIDQ6323675

Publication date: 14 August 2019

Abstract: We revisit several results concerning club principles and nonsaturation of the nonstationary ideal, attempting to improve them in various ways. So we typically deal with a (non necessarily normal) ideal

J

extending the nonstationary ideal on a regular uncountable (non necessarily successor) cardinal

k a p p a

, our goal being to witness the nonsaturation of

J

by the existence of towers (of length possibly greater than

k a p p a^{+}

).

Mathematics Subject Classification ID

Other combinatorial set theory (03E05)

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