Abstract
In this paper a rapid non-interval P-point and a rapid non-weakly Ramsey interval P-point are constructed assuming Continuum Hypothesis or Martin's Axiom. These constructions, with the help of geometric interpretations for some needed configurations, provide the examples of rapid ultrafilters for an affirmative answer to a question of Blass, Di Nasso, and Forti.
Original language | English |
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Article number | 107333 |
Journal | Topology and its Applications |
Volume | 283 |
DOIs | |
State | Published - 1 Sep 2020 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2020 Elsevier B.V.
Keywords
- Interval P-point
- P-point
- Quasi-selective ultrafilter
- Rapid ultrafilter
- Selective ultrafilter
- Weakly Ramsey ultrafilter