Antichains in partially ordered sets of singular cofinality

dc.creatorRinot, Assaf
dc.date2006-06-01
dc.date2006-12-17
dc.date.accessioned2026-07-07T07:35:31Z
dc.date.available2026-07-07T07:35:31Z
dc.descriptionIn their paper from 1981, Milner and Sauer conjectured that for any poset P, if cf(P)=lambda>cf(lambda)=kappa, then P must contain an antichain of size kappa. We prove that for lambda>cf(lambda)=kappa, if there exists a cardinal mu<lambda such that cov(lambda,mu,kappa,2)=lambda, then any poset of cofinality lambda contains lambda^kappa antichains of size kappa. The hypothesis of our theorem is very weak and is a consequence of many well-known axioms such as GCH, SSH and PFA. The consistency of the negation of this hypothesis is unknown.
dc.description8 pages, reorganized structure
dc.identifierhttps://arxiv.org/abs/math/0606021
dc.identifierhttp://arxiv.org/abs/math/0606021
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/120118
dc.subjectLogic
dc.subjectCombinatorics
dc.subject03E04, 03E35, 06A07
dc.titleAntichains in partially ordered sets of singular cofinality
dc.typetext

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