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arXiv 2103.14911math.GR
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不嵌入Thompson群$F$的$\mathrm{PL}_+ I$子群

Subgroups of $\mathrm{PL}_+ I$ which do not embed into Thompson's group $F$

James Hyde, Justin Tatch Moore

摘要:

我们将给出一个通用标准-$F$ -阻塞的存在-用于显示$\mathrm{PL}_+ I$的亚组不嵌入到Thompson组$F$中。一个直接的结果是Cleary的“黄金比例”基团$F_τ$不能嵌入$F$。我们的结果也产生了一个新的证明,斯坦的团体$F_{p,q}$不嵌入到$F$,一个结果首先建立了Lodha使用他的理论的连贯行动。我们发展了$F$的基本理论-障碍,并表明它们表现出一定的刚性现象的独立利益。在建立本文主要结果的过程中,我们证明了$\mathrm{PL}_+ I$的子群的一个二分法定理。除了在我们的证明中发挥核心作用外,它还足够强大,可以暗示鲁宾的重建定理仅限于$\mathrm{PL}_+ I$的子群类,也可以暗示布林的普遍性定理。

英文摘要:

We will give a general criterion - the existence of an $F$-obstruction - for showing that a subgroup of $\mathrm{PL}_+ I$ does not embed into Thompson's group $F$. An immediate consequence is that Cleary's "golden ratio" group $F_τ$ does not embed into $F$. Our results also yield a new proof that Stein's groups $F_{p,q}$ do not embed into $F$, a result first established by Lodha using his theory of coherent actions. We develop the basic theory of $F$-obstructions and show that they exhibit certain rigidity phenomena of independent interest. In the course of establishing the main result of the paper, we prove a dichotomy theorem for subgroups of $\mathrm{PL}_+ I$. In addition to playing a central role in our proof, it is strong enough to imply both Rubin's Reconstruction Theorem restricted to the class of subgroups of $\mathrm{PL}_+ I$ and also Brin's Ubiquity Theorem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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