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zbMATH Open
Article . 1991
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Proceedings of the American Mathematical Society
Article . 1991 . Peer-reviewed
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Proceedings of the American Mathematical Society
Article . 1991 . Peer-reviewed
Data sources: Crossref
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Saturated Families

Saturated families
Authors: Goldstern, Martin; Judah, Haim I.; Shelah, Saharon;

Saturated Families

Abstract

The family \({\mathcal A}\) of some countable subsets of the infinite cardinal \(\kappa\) is said to be saturated (or completely separable) if for all subsets x of \(\kappa\) either there is \(a\in {\mathcal A}\) with \(a\subseteq x\) or else there are finitely many sets \(a_ 1,...,a_ n\in {\mathcal A}\) with \(x-(a_ 1\cup...\cup a_ n)\) finite. Let S(\(\kappa\)) be the statement: there exists an infinite, almost disjoint, saturated family of countable subsets of the cardinal \(\kappa\). The existence of saturated families is a long-standing problem in set theory. In the early seventies Baumgartner showed that \(\forall nS(\aleph_ n)\) is a consequence of the Continuum Hypothesis. Later, \textit{A. Hajnal, I. Juhász} and \textit{L. Soukup} [Comment. Math. Univ. Carol. 28, 629-633 (1987; Zbl 0648.03034)] produced a forcing model to show the relative consistency of \(\forall \kappa S(\kappa)\). In this paper, the authors show that \(\forall \kappa S(\kappa)\) is a consequence of \(V=K\), where K is the core model. (In fact, they give more technical conditions under which their induction will go through.)

Keywords

core model, saturated families of countable subsets of infinite cardinals, Other combinatorial set theory

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
3
Average
Average
Average
bronze