The Borel Ramsey properties for countable Borel equivalence relations

We define some natural notions of strong and weak Borel Ramsey properties for countable Borel equivalence relations and show that they hold for a countable Borel equivalence relation if and only if the equivalence relation is smooth. We also consider some variation of the notion for hyperfinite non-smooth Borel equivalence relations.

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Publication Details

Journal
Proceedings of the American Mathematical Society
Published
2025-08-29
DOI
https://doi.org/10.1090/proc/17340
Primary Topic
Advanced Topology and Set Theory
Type
article
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article

The Borel Ramsey properties for countable Borel equivalence relations

Su Gao, Ming Xiao
Proceedings of the American Mathematical Society
Advanced Topology and Set Theory
article

The Borel Ramsey properties for countable Borel equivalence relations

Su Gao, Ming Xiao
article en

Abstract

We define some natural notions of strong and weak Borel Ramsey properties for countable Borel equivalence relations and show that they hold for a countable Borel equivalence relation if and only if the equivalence relation is smooth. We also consider some variation of the notion for hyperfinite non-smooth Borel equivalence relations.

Proceedings of the American Mathematical Society
Nankai University (CN)
Openalex Percentile: Top 72%
Advanced Topology and Set Theory
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The Borel Ramsey properties for countable Borel equivalence relations — Su Gao, Ming Xiao · Proceedings of the American Mathematical Society (2025) | TGRS Research Map | TGRS