Embedding groups into boundedly acyclic groups

Abstract We show that the ‐labeled Thompson groups and the twisted Brin–Thompson groups are boundedly acyclic. This allows us to prove several new embedding results for groups. First, every group of type embeds quasi‐isometrically into a boundedly acyclic group of type that has no proper finite index subgroups. This improves a result of Bridson and a theorem of Fournier‐Facio–Löh–Moraschini. Second, every group of type embeds quasi‐isometrically into a 5‐uniformly perfect group of type . Third, using Belk–Zaremsky's construction of twisted Brin–Thompson groups, we show that every finitely generated group embeds quasi‐isometrically into a finitely generated boundedly acyclic simple group. We also partially answer some questions of Brothier and Tanushevski regarding the finiteness property of ‐labeled Thompson group and .

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Publication Details

Journal
Journal of the London Mathematical Society
Published
2025-04-27
DOI
https://doi.org/10.1112/jlms.70164
Primary Topic
Geometric and Algebraic Topology
Type
article
Field-Weighted Citation Impact
0.00

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article

Embedding groups into boundedly acyclic groups

Fan Wu, Mengfei Zhao, ZIQING zhou, Xiaolei Wu
Journal of the London Mathematical Society
Geometric and Algebraic Topology
article

Embedding groups into boundedly acyclic groups

Fan Wu, Mengfei Zhao, ZIQING zhou, Xiaolei Wu
article en

Abstract

Abstract We show that the ‐labeled Thompson groups and the twisted Brin–Thompson groups are boundedly acyclic. This allows us to prove several new embedding results for groups. First, every group of type embeds quasi‐isometrically into a boundedly acyclic group of type that has no proper finite index subgroups. This improves a result of Bridson and a theorem of Fournier‐Facio–Löh–Moraschini. Second, every group of type embeds quasi‐isometrically into a 5‐uniformly perfect group of type . Third, using Belk–Zaremsky's construction of twisted Brin–Thompson groups, we show that every finitely generated group embeds quasi‐isometrically into a finitely generated boundedly acyclic simple group. We also partially answer some questions of Brothier and Tanushevski regarding the finiteness property of ‐labeled Thompson group and .

Journal of the London Mathematical SocietyVol. 111(5)
Fudan University (CN)
National Natural Science Foundation of China
Openalex Percentile: Top 86%
Geometric and Algebraic Topology
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