Aspects of singular cofinality

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We study properties of closure operators of singular cofi- nality, and introduce several ZFC sufficient and equivalent conditions for the existence of antichain sequences in posets of singular cofinality. We also notice that the Proper Forcing Axiom implies the Milner-Sauer conjecture.
Original languageAmerican English
Pages (from-to)185-204
JournalContributions to Discrete Mathematics
Issue number2
StatePublished - 2007


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