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Thompson群T的无$\boldsymbol{\mathbb{Z}^2}$子群是虚自由的

$\mathbb{Z}^2$-free subgroups of Thompson's $T$ are virtually free

Nicolás Matte Bon, Michele Triestino

arXiv 2608.16530首次发表:更新:

AI 中文总结

本文证明Thompson群T的有限生成且不含任意高阶阿贝尔群的子群为虚阿贝尔或虚自由,进而得出曲面群不能嵌入T,解答了Belk与Moore的公开问题。

AI 中文摘要

确定曲面群能否嵌入Thompson群V是一个公开问题。本文证明,Thompson群T的任意有限生成、不含任意高阶阿贝尔群的子群,要么是虚阿贝尔的,要么是虚自由的。特别地,曲面群不能嵌入T,回答了Belk与Moore提出的问题。

英文摘要

It is an open problem to determine whether surface groups can embed in Thompson's group $V$. We prove that any finitely generated subgroup of Thompson's group $T$ without abelian groups of arbitrary high rank is either virtually abelian or virtually free. In particular, surface groups don't embed in $T$, answering a question of Belk and Moore.

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