More definable combinatorics around the first and second uncountable cardinals

Journal of Mathematical Logic 23 (3) (2023)
  Copy   BIBTEX

Abstract

Assume [Formula: see text]. If [Formula: see text] is an ordinal and X is a set of ordinals, then [Formula: see text] is the collection of order-preserving functions [Formula: see text] which have uniform cofinality [Formula: see text] and discontinuous everywhere. The weak partition properties on [Formula: see text] and [Formula: see text] yield partition measures on [Formula: see text] when [Formula: see text] and [Formula: see text] when [Formula: see text]. The following almost everywhere continuity properties for functions on partition spaces with respect to these partition measures will be shown. For every [Formula: see text] and function [Formula: see text], there is a club [Formula: see text] and a [Formula: see text] so that for all [Formula: see text], if [Formula: see text] and [Formula: see text], then [Formula: see text]. For every [Formula: see text] and function [Formula: see text], there is an [Formula: see text]-club [Formula: see text] and a [Formula: see text] so that for all [Formula: see text], if [Formula: see text] and [Formula: see text], then [Formula: see text]. The previous two continuity results will be used to distinguish the cardinalities of some important subsets of [Formula: see text]. [Formula: see text]. [Formula: see text]. [Formula: see text]. It will also be shown that [Formula: see text] has the Jónsson property: For every [Formula: see text], there is an [Formula: see text] with [Formula: see text] so that [Formula: see text].

Links

PhilArchive



    Upload a copy of this work     Papers currently archived: 92,323

External links

Setup an account with your affiliations in order to access resources via your University's proxy server

Through your library

Similar books and articles

The spectrum of partitions of a Boolean algebra.J. Donald Monk - 2001 - Archive for Mathematical Logic 40 (4):243-254.
Generating ultrafilters in a reasonable way.Andrzej Rosłanowski & Saharon Shelah - 2008 - Mathematical Logic Quarterly 54 (2):202-220.
On nice equivalence relations on λ2.Saharon Shelah - 2004 - Archive for Mathematical Logic 43 (1):31-64.
Optimal proofs of determinacy.Itay Neeman - 1995 - Bulletin of Symbolic Logic 1 (3):327-339.
Definable partitions and reflection properties for regular cardinals.Evangelos Kranakis - 1985 - Notre Dame Journal of Formal Logic 26 (4):408-412.
Large Cardinals, Inner Models, and Determinacy: An Introductory Overview.P. D. Welch - 2015 - Notre Dame Journal of Formal Logic 56 (1):213-242.

Analytics

Added to PP
2023-01-05

Downloads
8 (#1,323,248)

6 months
7 (#439,668)

Historical graph of downloads
How can I increase my downloads?

Author's Profile

William Chan
University of Manchester

Citations of this work

No citations found.

Add more citations

References found in this work

Ordinal definability and combinatorics of equivalence relations.William Chan - 2019 - Journal of Mathematical Logic 19 (2):1950009.
A dichotomy for the definable universe.Greg Hjorth - 1995 - Journal of Symbolic Logic 60 (4):1199-1207.
The cardinals below |[ω1]<ω1|.W. Hugh Woodin - 2006 - Annals of Pure and Applied Logic 140 (1-3):161-232.

View all 7 references / Add more references