Upward directedness of the Rudin-Keisler ordering of p-points

DOI10.2307/2274638zbMath0709.03038OpenAlexW1980986150MaRDI QIDQ3491538

Claude Laflamme

Publication date: 1990

Published in: Journal of Symbolic Logic (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.2307/2274638

zbMATH Keywords

P-pointsRudin-Keisler orderingNear Coherence Filter

Mathematics Subject Classification ID

Consistency and independence results (03E35)

Related Items (1)

Tukey types of ultrafilters

Cites Work

• There may be simple \(P_{\aleph _ 1}\)- and \(P_{\aleph _ 2}\)-points and the Rudin-Keisler ordering may be downward directed
• Set theory. An introduction to independence proofs
• Some points in βN
• Ultrafilters on a countable set
• The Picard group of noncommutative rings, in particular of orders

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