Ultrafilters on ω

Journal of Symbolic Logic 60 (2):624-639 (1995)
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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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References found in this work

Ultrafilters on a Countable Set.David Booth - 1970 - Annals of Mathematical Logic 2 (1):1.

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