Big mapping class groups are not extremely amenable
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866929509272387584 |
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| author | Long, Yusen |
| author_facet | Long, Yusen |
| contents | This paper uses the renowned Kechris-Pestov-Todorčević machinery to show that (big) mapping class groups are not extremely amenable unless the underlying surface is a sphere or a once-punctured sphere, or equivalently when the mapping class group is trivial. The same techniques also show that the pure mapping class groups, as well as compactly supported mapping class groups, of a surface with genus at least one can never be extremely amenable. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_12408 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Big mapping class groups are not extremely amenable Long, Yusen Geometric Topology Group Theory 57K20, 54H11 This paper uses the renowned Kechris-Pestov-Todorčević machinery to show that (big) mapping class groups are not extremely amenable unless the underlying surface is a sphere or a once-punctured sphere, or equivalently when the mapping class group is trivial. The same techniques also show that the pure mapping class groups, as well as compactly supported mapping class groups, of a surface with genus at least one can never be extremely amenable. |
| title | Big mapping class groups are not extremely amenable |
| topic | Geometric Topology Group Theory 57K20, 54H11 |
| url | https://arxiv.org/abs/2307.12408 |