Connections Between Kuratowski Partitions of Baire Spaces, Measurable Cardinals, and Precipitous Ideals

In this paper, we investigate the existence and properties of Kuratowski partitions (K-partitions), i.e., partitions of Baire spaces such that all subfamilies of such partition sum to a set with the Baire property. We focus on the inherent symmetries in their structure and prove their connections to existence of measurable cardinals and precipitous ideals. Our results reveal that the existence of a K-partition in any Baire or compact space is symmetrically reflected in metrizable and completely metrizable spaces, respectively, and we explore how these symmetries extend to the realm of set-theoretic ideals and large cardinals. We also outline possible connections with real-measurable cardinals, extensions of Lebesgue measure on the closed interval, and density topologies.

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Publication Details

Journal
Symmetry
Published
2025-09-02
DOI
https://doi.org/10.3390/sym17091426
Primary Topic
Advanced Topology and Set Theory
Type
article
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article

Connections Between Kuratowski Partitions of Baire Spaces, Measurable Cardinals, and Precipitous Ideals

Sławomir Kusiński
Symmetry
Advanced Topology and Set Theory
article

Connections Between Kuratowski Partitions of Baire Spaces, Measurable Cardinals, and Precipitous Ideals

Sławomir Kusiński
article en

Abstract

In this paper, we investigate the existence and properties of Kuratowski partitions (K-partitions), i.e., partitions of Baire spaces such that all subfamilies of such partition sum to a set with the Baire property. We focus on the inherent symmetries in their structure and prove their connections to existence of measurable cardinals and precipitous ideals. Our results reveal that the existence of a K-partition in any Baire or compact space is symmetrically reflected in metrizable and completely metrizable spaces, respectively, and we explore how these symmetries extend to the realm of set-theoretic ideals and large cardinals. We also outline possible connections with real-measurable cardinals, extensions of Lebesgue measure on the closed interval, and density topologies.

SymmetryVol. 17(9)
Silesian University of Technology (PL)
Openalex Percentile: Top 71%
Advanced Topology and Set Theory
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