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

Claude Laflamme

Journal of Symbolic Logic 55 (2):449-456 (1990)

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Ultrafilters on a countable set.David Booth - 1970 - Annals of Mathematical Logic 2 (1):1.details Logic and Philosophy of Logic Model Theory in Logic and Philosophy of Logic Direct download (4 more) Export citation Bookmark 31 citations
There may be simple Pℵ1 and Pℵ2-points and the Rudin-Keisler ordering may be downward directed.Andreas Blass & Saharon Shelah - 1987 - Annals of Pure and Applied Logic 33 (C):213-243.details Logic and Philosophy of Logic Model Theory in Logic and Philosophy of Logic Direct download (4 more) Export citation Bookmark 46 citations
Set Theory. An Introduction to Independence Proofs.James E. Baumgartner & Kenneth Kunen - 1986 - Journal of Symbolic Logic 51 (2):462.details Logic and Philosophy of Logic Logic and Philosophy of Logic, Miscellaneous in Logic and Philosophy of Logic Direct download (4 more) Export citation Bookmark 147 citations

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