arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~

扭转猜想与考克斯特群的同构问题

The Twist Conjecture and the Isomorphism Problem for Coxeter groups

Elia Fioravanti

arXiv 2608.28348首次发表:更新:

AI 中文总结

该研究证明了考克斯特群的扭转猜想,结合前期工作解决了考克斯特群的同构问题,还得出考克斯特群的自同构群有限生成的推论,未使用人工智能开展研究。

AI 中文摘要

我们证明了米尔赫(Mühlherr)的扭转猜想:考克斯特群的任意两个角度兼容的考克斯特生成集,可通过有限次基本扭转和一次共轭变换得到。结合豪利特-米尔赫(Howlett-Mühlherr)及马基斯-米尔赫(Marquis-Mühlherr)的前期工作,这完整解决了考克斯特群的同构问题。另一推论是,对任意考克斯特群$W$,其自同构群${\rm Aut}(W)$是有限生成的,且存在一种算法,可从任意考克斯特矩阵出发,生成${\rm Aut}(W)$的有限生成元集。在扭转猜想的大量文献中,我们仅核心用到两项结果:卡普雷斯(Caprace)和米尔赫证明的2-球形考克斯特系统的强刚性,以及卡普雷斯和普热伊茨基(Przytycki)为扭转刚性情形开发的标记与分层框架。我们还从根本上利用了JSJ理论的一些软思想,以及米哈尔克-灿茨(Mihalik-Tschantz)关于考克斯特群分裂的一项观察。本手稿的撰写及所呈现的研究均未使用任何形式的人工智能。

英文摘要

We prove Mühlherr's Twist Conjecture: any two angle-compatible Coxeter generating sets of a Coxeter group differ by a finite sequence of elementary twists and a conjugation. Combined with earlier work of Howlett-Mühlherr and Marquis-Mühlherr, this completes the resolution of the Isomorphism Problem for Coxeter groups. A further consequence is that ${\rm Aut}(W)$ is finitely generated for every Coxeter group $W$, and there is an algorithm producing a finite set of generators for ${\rm Aut}(W)$ starting from any Coxeter matrix. Of the vast literature on the Twist Conjecture, we utilise only two results in an essential way: strong rigidity of $2$--spherical Coxeter systems, due to Caprace and Mühlherr, and the framework of markings and hierarchies developed by Caprace and Przytycki for the twist-rigid case. We also exploit in a fundamental way some soft ideas from JSJ theory and an observation of Mihalik-Tschantz on splittings of Coxeter groups. No form of AI was used in the writing of this manuscript, nor in the research that it presents.

Comments48 pages

论文原文

arXiv 摘要页 · PDF 原文 · HTML 原文

↑