Abstract
We study some limitations and possible occurrences of uniform ultrafilters on ordinals without the axiom of choice. We prove an Easton-like theorem about the possible spectrum of successors of regular cardinals which carry uniform ultrafilters; we also show that this spectrum is not necessarily closed.
Original language | English |
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Pages (from-to) | 285-298 |
Number of pages | 12 |
Journal | Commentationes Mathematicae Universitatis Carolinae |
Volume | 60 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2019 |