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Ramsey ultrafilters and the reaping number—con(r
Annals of Pure and Applied Logic 49 (2):121-142 (1990)
Abstract
We show that it is consistent that the reaping number r is less than u , the size of the smallest base for an ultrafilter. To show that our forcing preserves certain ultrafilters, we prove a general partition theorem involving Ramsey idealsOther Versions
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Citations of this work
Free sequences in $${mathscr {P}}left /text {fin}$$ P ω / fin.David Chodounský, Vera Fischer & Jan Grebík - 2019 - Archive for Mathematical Logic 58 (7-8):1035-1051.
Partition Forcing and Independent Families.Jorge A. Cruz-Chapital, Vera Fischer, Osvaldo Guzmán & Jaroslav Šupina - 2023 - Journal of Symbolic Logic 88 (4):1590-1612.
Reasonable Ultrafilters, Again.Andrzej Rosłanowski & Saharon Shelah - 2011 - Notre Dame Journal of Formal Logic 52 (2):113-147.
Cichoń’s diagram and localisation cardinals.Martin Goldstern & Lukas Daniel Klausner - 2020 - Archive for Mathematical Logic 60 (3):343-411.
References found in this work
There may be simple Pℵ1 and Pℵ2-points and the Rudin-Keisler ordering may be downward directed.Andreas Blass & Saharon Shelah - 1987 - Annals of Pure and Applied Logic 33 (C):213-243.
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