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No universal group in a cardinal

Authors
  • Shelah, Saharon
Type
Published Article
Journal
Forum Mathematicum
Publisher
De Gruyter
Publication Date
Jul 31, 2015
Volume
28
Issue
3
Pages
573–585
Identifiers
DOI: 10.1515/forum-2014-0040
Source
De Gruyter
Keywords
License
Yellow

Abstract

For many classes of models, there are universal members in any cardinal λ which “essentially satisfies GCH, i.e., λ = 2<λ,” in particular for the class of models of a complete first-order T (well, if at least λ > |T|). But if the class is “complicated enough”, e.g., the class of linear orders, we know that if λ is “regular and not so close to satisfying GCH”, then there is no universal member. Here, we find new sufficient conditions (which we call the olive property), not covered by earlier cases (i.e., fail the so-called SOP4). The advantage of those conditions is witnessed by proving that the class of groups satisfies one of those conditions.

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