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arXiv:2305.02794 [math.LO]AbstractReferencesReviewsResources

Ultrafilters without immediate predecessors in Rudin-Frolik order for regulars

Joanna Jureczko

Published 2023-03-28Version 1

The aim of this paper is to construct ultrafilters without immediate predecessors in the Rudin-Frolik order in $\beta \kappa\setminus \kappa$, where $\kappa$ is a regular cardinal. This generalizes the problem posed by Peter Simon more than 40 years ago.

Comments: arXiv admin note: substantial text overlap with arXiv:2304.02143, arXiv:2304.00097, arXiv:2304.01398
Categories: math.LO
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