Ultrafilters on ω

Journal of Symbolic Logic 60 (2):624-639 (1995)
Abstract
We study the I-ultrafilters on ω, where I is a collection of subsets of a set X, usually R or ω 1 . The I-ultrafilters usually contain the P-points, often as a small proper subset. We study relations between I-ultrafilters for various I, and closure of I-ultrafilters under ultrafilter sums. We consider, but do not settle, the question whether I-ultrafilters always exist
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DOI 10.2307/2275854
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Van Douwen's Diagram for Dense Sets of Rationals.Jörg Brendle - 2006 - Annals of Pure and Applied Logic 143 (1):54-69.
Free Boolean Algebras and Nowhere Dense Ultrafilters.Aleksander Błaszczyk - 2004 - Annals of Pure and Applied Logic 126 (1-3):287-292.
Hierarchies of Measure-Theoretic Ultrafilters.Michael Benedikt - 1999 - Annals of Pure and Applied Logic 97 (1-3):203-219.
Cascades, Order, and Ultrafilters.Andrzej Starosolski - 2014 - Annals of Pure and Applied Logic 165 (10):1626-1638.

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