Alexander Kolpakov, Alexey Talambutsa
We prove that for any infinite right-angled Coxeter or Artin group, its spherical and geodesic growth rates (with respect to the standard generating set) either take values in the set of Perron numbers, or equal $1$. Also, we compute the average number of geodesics representing an element of given word length in such groups.
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Geodesic growth in right-angled and even Coxeter groups
本文的目的是检测一个正则图的哪些组合性质可以完全确定直角Coxeter或Artin群的测地增长图定义，并提供直角和甚至Coxeter群具有相同的测地增长系列的第一个例子。
We determine the asymptotic number of index $n$ subgroups in virtually cyclic right-angled Coxeter groups and their free products as $n\to\infty$.
Recognizing Right-Angled Coxeter Groups Using Involutions
我们考虑的问题，确定是否一个给定的组（特别是一个生成的对合）是一个直角Coxeter群。我们描述了一个群不变量，对合图，我们的特征的直角Coxeter群的对合图。我们用这个特征来描述一个过程，为一个给定的组或证明，一个不可能存在的候选人直角Coxeter介绍。我们提供一些初步的应用。此外，我们还给出了直角Coxeter群定义图的刚性的一个初等证明。我们还恢复了一个结果，即如果定义图不包含SIL，则Aut^0（W）是直角Coxeter群。
Aut-invariant word norm on right angled Artin and right angled Coxeter groups
我们证明了直角Artin和直角Coxeter群上的Aut-invariant词范数是无界的（除了少数特殊情况）。为了证明无界性，我们展示了某些特征子群。这使我们能够找到无界拟同构，这是Lipschitz方面的自动不变词规范。
Quasi-isometric rigidity of a class of right-angled Coxeter groups
建立了一类直角Coxeter群的拟等距刚性。设$Γ_1,Γ_2$是有限广义厚$m$ -图与$m\geq 3$的连接.我们证明了相应的直角Coxeter群是拟等距的当且仅当$Γ_1,Γ_2$是同构的。我们还给出了可分解的直角Coxeter群的构造。
Rigidity of Right-Angled Coxeter Groups
研究直角Coxeter群的刚性性质，证明不同生成集下的Coxeter系统等价性。
We study Morse subgroups and Morse boundaries of random right-angled Coxeter groups in the Erdős--Rényi model. We show that at densities below $\left(\sqrt{\frac{1}{2}}-ε\right)\sqrt{\frac{\log{n}}{n}}$ random right-angled Coxeter groups almost surely have Morse hyperbolic surface subgroups. This implies their Morse boundaries contain embedded circles and they cannot be quasi-isometric to a right-angled Artin group. Further, at densities above $\left(\sqrt{\frac{1}{2}}+ε\right)\sqrt{\frac{\log{n}}{n}}$ we show that, almost surely, the hyperbolic Morse special subgroups of a random right-angled…
In this article, we study the manifold structure and the relatively hyperbolic structure of right-angled Coxeter groups with planar nerves. We then apply our results to the quasi-isometry problem for this class of right-angled Coxeter groups.
Actions of Right-Angled Coxeter Groups on the Croke Kleiner Spaces
这是一个悬而未决的问题是否直角Coxeter群有唯一的组等变视觉边界。克罗克和克莱纳提出了一个直角的Artin组，具有多个视觉边界。本文给出了一个具有非唯一等变视觉边界的直角Coxeter群。主要定理是，如果直角Coxeter群几何地作用在Croke-Kleiner空间上，则这些空间中的局部角都必须是直角。我们提出了一个特殊的直角Coxeter群与非唯一的等变视觉边界。然而，我们猜想，直角Coxeter群，可以几何作用在一个给定的CAT（0）空间是远远不是唯一的。
Relative hyperbolicity and right-angled Coxeter groups
我们发现，直角Coxeter群是相对双曲的意义上定义的Farb，相对于自然收集的秩2抛物子群。
Reconstructible graphs, simplicial flag complexes of homology manifolds and associated right-angled Coxeter groups
本文研究了有限图、单纯旗复形和直角Coxeter群之间的关系，给出了一类可重构的有限图。证明了如果$Γ$是一个有限图，且该图是某个单旗复形$L$的1-骨架，而$L$是一个维数为$n \ge 1$的同调流形，则图$Γ$是可重构的.
We investigate the planarity of the boundaries of right-angled Coxeter groups. We show that non-planarity of the defining graph does not necessarily imply non-planarity of every boundary of the associated right-angled Coxeter group, although it does in many cases. Our techniques yield a characterization of the triangle-free defining graphs such that the associated right-angled Coxeter group has boundary a Menger curve.
$\mathrm{CAT}(0)$ Extensions of Right-angled Coxeter Groups
证明了直角Coxeter群$W_Γ$的任意有穷级生成自同构的分裂扩张忠实地几何地作用在$\mathrm{CAT}(0)$度量空间上.
RAAGedy right-angled Coxeter groups II: in the quasiisometry class of the tree RAAGs
本文对拟等距于树 RAAG 的二维右角 Coxeter 群分类，证明满足条件的此类群含可见有限指数右角 Artin 子群，解决了特定拟等距类群的结构问题。
Reflection subgroups of odd-angled Coxeter groups
本文给出了一个由反射生成的奇角Coxeter群具有一个由反射生成的真有限指数子群的判据。答案是根据最小的素除子的指数的考克斯特关系。
Divergence in right-angled Coxeter groups
设W是二维直角Coxeter群。我们用线性和二次发散度证明了这样的W，并构造了具有任意次发散多项式的直角Coxeter群。我们的证明使用的结构墙在戴维斯复杂。
We show that the Morse boundary of a right-angled Coxeter group may contain embedded circles that do not arise as the boundary of a Morse Fuchsian subgroup visible in the defining graph.
The large-scale geometry of right-angled Coxeter groups
这是一个调查的一些方面的大规模几何的直角Coxeter集团。重点是最近的结果，他们的负曲率性质，边界，和他们的准等距和可扩展性分类。
The strong Atiyah conjecture for right-angled Artin and Coxeter groups
证明了直角Artin群和直角Coxeter群的强Atiyah猜想。更一般地说，我们证明了它的某些有限扩张或基本服从扩展的群体，这样的群体。
A classification of right-angled Coxeter groups with no 3-flats and locally connected boundary
若$(W,S)$是直角Coxeter系统，且$W$没有$\mathbb Z^3$子群，则证明了$(W,S)$的表示图中没有初等分离性意味着所有被$W$几何作用的CAT（0）空间都有局部连通的CAT（0）边界.如果一般直角Coxeter系统的表示图满足分离性，则$W$几何作用的所有CAT（0）空间都有非局部连通边界.特别地，这给出了没有3-平坦且具有局部连通边界的直角Coxeter群的完全分类。
Strongly Primitive Salem Growth Polynomials for Right-Angled Coxeter Groups
通过定义图的团多项式研究直角Coxeter群的标准球面增长率，证明每个偶数度至少4可作为强本原Salem增长率的度数，并给出独立多项式对指定Salem多项式的阻碍。
Subgroup growth of right-angled Artin and Coxeter groups
我们确定了直角Artin群的有限指数子群个数的阶乘增长率作为指数的函数。这证明仅仅依赖于定义图的独立数。我们还提出了一个猜想，直角Coxeter群，并证明它在有限的设置。
In this paper we study the right-angled Coxeter groups that acts geometrically on the Salvetti complex of a certain right-angled Artin group, which we refer to as Croke-Kleiner spaces. We prove that any right-angled Coxeter group that acts geometrically on the Croke-Kleiner spaces acts with $π/2$ angles between reflecting axes, while the quasi-isometric right-angled Artin group can act with angles that are any real number in the range $(0, π/2]$. The contrast between the two examples shows that in this case a right-angled Coxeter group is geometrically more "rigid" than its quasi isometric cou…
On asymptotic dimension of amalgamated products and right-angled Coxeter groups
证明了不等式$$ \as A\ast_CB\le\max\{\as A,\as B,\as C+1\} $$，并应用这个不等式证明了任意直角Coxeter群的渐近维数不超过其Davis复形的维数.
A Perron theorem for matrices with negative entries and applications to Coxeter groups
Handelman（J. Operator Theory，1981）证明了如果矩阵$A$的谱半径是特征多项式的单根并且严格大于任何其他根的模，则$A$共轭于矩阵$Z$，其中某些幂是正的。本文给出了一个显式共轭矩阵$Z$，并证明了$A$的谱半径是$A$的单优势特征值当且仅当$Z$最终为正.对于每一行和都等于$1$的$n\times n$实矩阵，这个准则可以归结为检查某个幂的每一项严格大于同一列的项的平均值减去$\frac{1}{n}$。我们应用该准则的元素不可约无限非仿射Coxeter群的谱半径，这仍然是未知的优势提供证据。
Minimality of the boundary of a right-angled Coxeter system
本文证明了直角Coxeter系统$(W,S)$的边界$\partialΣ(W,S)$是极小的当且仅当$W_{\tilde{S}}$是不可约的，其中$W_{\tilde{S}}$是$W$中有限指数的极小抛物子群.我们还提供了几个应用程序和注释。特别地，我们得到了对于直角Coxeter系统$(W,S)$，集合$\{w^{\infty} | w\in W, o(w)=\infty\}$在边界$\partialΣ(W,S)$是稠密的.
A quasi-isometry invariant and thickness bounds for right-angled Coxeter groups
我们引入了一个新的准等距不变的2维直角Coxeter组，超图指数，这些群体划分成无限多个准等距类，每个类包含无限多个群体。此外，任何直角Coxeter群的超图指数可以直接从群的定义图计算。超图指数给出了直角Coxeter群的厚度阶、代数厚度阶和散度函数的上界。最后，给定一个整数n>1，我们给出了直角Coxeter群的例子，这些群的阶数为n，但代数上的阶数严格大于n，回答了Behrstock-Drutu-Mosher的一个问题。
Coxeter systems with $2$-dimensional Davis complexes, growth rates and Perron numbers
本文研究低维Coxeter系统的增长率，证明其神经欧拉示性数的符号对应增长率为Salem、Pisot数，并构造了负欧拉示性数下增长率为Perron数的无穷多非双曲Coxeter系统，推广了已有结果。
We define a large class of abstract Coxeter groups, that we call $\infty$--spanned, and for which the word growth rate and the geodesic growth rate appear to be Perron numbers. This class contains a fair amount of Coxeter groups acting on hyperbolic spaces, thus corroborating a conjecture by Kellerhals and Perren. We also show that for this class the geodesic growth rate strictly dominates the word growth rate.
Virtually Fibering Right-Angled Coxeter Groups
我们证明了某些直角Coxeter群有有限指数子群，商$\mathbb Z$与生成核。证明使用Bestvina-Brady莫尔斯理论促进组合参数。我们描述了计划成功或失败的各种例子。其中成功的例子是具有基本区的$\mathbb H^4$中的直角反射群，即$120$ -胞腔或$24$ -胞腔。
Polyhedral products and commutator subgroups of right-angled Artin and Coxeter groups
本文构造并研究了直角Artin群、Coxeter群、一般图积群及其换位子群空间的多面体积模型。作为应用，我们给出了图积群的换位子群自由的一个判别准则，并给出了直角Coxeter群的换位子群的一个显式极小生成元集.
In this paper, we prove that all finitely generated malnormal subgroups of one-ended right-angled Coxeter groups are strongly quasiconvex and they are in particular quasiconvex when the ambient groups are hyperbolic. The key idea is to prove all infinite proper malnormal subgroups of one-ended right-angled Coxeter groups are join-free and then prove the strong quasiconvexity and the virtual freeness of these subgroups. We also study the subgroup divergence of join-free subgroups in right-angled Coxeter groups and compare them with the analogous subgroups in right-angled Artin groups. We charac…
The lower central series of the rgiht-angled Coxeter group $RC_\mathcal K$ and the corresponding graded Lie algebra $L(RC_\mathcal K)$ associated with the lower central series of a right-angled Coxeter group are studied. Relations are obtained in the graded components of the Lie algebra $L(RC_\mathcal K)$. A basis of the fourth graded component $L(RC_\mathcal K)$ for groups with at most $4$ generators was described.
We study the lower central series of a right-angled Coxeter group $RC_K$ and the associated Lie algebra $L(RC_K)$. The latter is related to the graph Lie algebra $L_K$. We give an explicit combinatorial description of the first three consecutive factors of the lower central series of the group $RC_K$.
Using a variant of an unpublished argument due to Agol, we show that an irreducible right-angled Coxeter group on ${n \geq 3}$ vertices embeds as a thin subgroup of a uniform arithmetic lattice in an indefinite orthogonal group $\mathrm{O}(p, q)$ for some $p, q \geq 1$ satisfying $p+q=n$.
Divergence of CAT(0) Cube Complexes and Coxeter Groups
我们提供了CAT（0）立方复形的一对超平面上的几何条件，这些条件暗示了立方复形的发散界。作为应用，我们对所有具有二次发散的直角Coxeter群进行了分类，并证明了直角Coxeter群不能表现出二次和三次之间的发散函数。这推广了Dani-Thomas的一个定理，该定理涉及2维直角Coxeter群。作为另一个应用，我们提供了一个归纳图论标准的直角Coxeter群的定义图，使我们能够识别任意整数阶多项式发散的许多无限类的直角Coxeter群。我们也提供了类似的发散结果，某些类的Coxeter群是不直角的。
On consecutive factors of the lower central series of right-angled Coxeter groups
该研究针对右角Coxeter群的下中心列及相伴分次Lie代数展开，核心是描述任意$\u212c$对应的第四分次分量的基，为相关代数结构分析提供基础。
Elementary equivalence of right-angled Coxeter groups and graph products of finite abelian groups
证明了有限阿贝尔群的图积初等等价当且仅当它们是$\exists\forall$ -等价的当且仅当它们是同构的.特别地，两个直角Coxeter群初等等价当且仅当它们同构。
Let $Γ$ be a connected, triangle-free, planar graph with at least five vertices that has no separating vertices or edges. If the graph $Γ$ is $\mathcal{CFS}$, we prove that the right-angled Coxeter group $G_Γ$ is virtually a Seifert manifold group or virtually a graph manifold group and we give a complete quasi-isometry classification of these such groups. Otherwise, we prove that $G_Γ$ is hyperbolic relative to a collection of $\mathcal{CFS}$ right-angled Coxeter subgroups of $G_Γ$. Consequently, the divergence of $G_Γ$ is linear, or quadratic, or exponential. We also generalize right-angled …
Equivariant formality and the cohomology of subgroups of right-angled Coxeter groups
本文研究了右角Coxeter群的coabelian子群的分类空间模型，通过实moment-angle复形的同调轨道空间构造，并利用Borel等效上同调理论分析其上同调结构，提出图论判据判断coabelian子群的上同调自由性。
In this paper we exhibit two infinite families of trees $\{T^1_n\}_{n \geq 17}$ and $\{T^2_n\}_{n \geq 17}$ on $n$ vertices, such that $T^1_n$ and $T^2_n$ are non-isomorphic, co-spectral, and the right-angled Coxeter groups (RACGs) based on $T^1_n$ and $T^2_n$ have the same geodesic growth with respect to the standard generating set. We then show that the spectrum of a tree does is not sufficient to determine the geodesic growth of the RACG based on that tree, by providing two infinite families of trees $\{S^1_n\}_{n \geq 11}$ and $\{S^2_n\}_{n \geq 11}$, on $n$ vertices, such that $S^1_n$ and…
Higman-Thompson groups and profinite properties of right-angled Coxeter groups
本文证明了右角Coxeter群在Coxeter群中具有profinite刚性，并展示了某些RACG具有无限profinite genus，同时推广了Higman关于Thompson群$V$的生成结果。
Local Connectivity of Right-angled Coxeter group boundaries
本文研究直角 Coxeter 群所作用 CAT(0) 空间边界的局部连通性，给出由定义图刻画的充分条件，并对已发表版本进行证明精简与插图补充。
Visual right-angled Artin subgroups of two-dimensional right-angled Coxeter groups
本文研究二维直角 Coxeter 群中直角 Artin 有限指数子群的存在性，将其与图的卫星可拆解性联系起来，并给出构造合适子图或判定不存在的算法。
We give a criterion of the existence of a presentation with a single relation for the commutator subgroup $RC_{\mathscr{K}}'$ of a right-angled Coxeter group $RC_{\mathscr{K}}$. Namely, we prove that $RC_{\mathscr{K}}'$ is a one-relator group if and only if $\mathscr{K}$ is either a $p$-cycle with $p\geqslant4$ or has the form ($p$-cycle)$*Δ^q$ with $p\geqslant4$ and $g\geqslant0$, where $Δ^q$ is a $q$-simplex.
Right-angled Artin subgroups of right-angled Coxeter and Artin groups
本文研究了直角Coxeter群和直角Artin群的子群何时为RAAGs，刻画了2维RACGs的有限指数视觉RAAG子群，并应用此结果证明了2维单端RACG拟等距于RAAG的充要条件，同时给出了非平面定义图的新例子及Dyer结果的新证明。
A threshold for relative hyperbolicity in random right-angled Coxeter groups
本文确定了以Erd{\H o}s--Rényi随机图为表现图的随机右角Coxeter群相对双曲性的阈值为$p=1/\sqrt{n}$，并揭示了其发散性区间及对应随机游走的中心极限定理性质。
Random Coxeter Groups
关于随机直角Coxeter群（即，直角Coxeter群，其定义图是Erdös-Rényi模型下的随机图）。本文将这一模型推广到一般随机Coxeter群的研究，给出了关于随机Coxeter群的一些结果，包括关于随机Coxeter群的神经的同调性的一些信息，以及随机Coxeter群何时是$δ$ -双曲群和何时具有FC-型性质的结果.
Fixed-point-free involutions on the boundaries of Right-angled Coxeter Groups
本文证明 Nica 关于边界存在无不动点对合的猜想在直角 Coxeter 群情形下的变体，并为原词双曲群问题提供方法启发。
In the spirit of peripheral subgroups in relatively hyperbolic groups, we exhibit a simple class of quasi-isometrically rigid subgroups in graph products of finite groups, which we call eccentric subgroups. As an application, we prove that, if two right-angled Coxeter groups $C(Γ_1)$ and $C(Γ_2)$ are quasi-isometric, then for any minsquare subgraph $Λ_1 \leq Γ_1$ there exists a minsquare subgraph $Λ_2 \leq Γ_2$ such that the right-angled Coxeter groups $C(Λ_1)$ and $C(Λ_2)$ are quasi-isometric as well. Various examples of non-quasi-isometric groups are deduced. Our arguments are based on a stu…
Commensurability for certain right-angled Coxeter groups and geometric amalgams of free groups
我们给出了明确的充要条件，抽象的某些家庭的1-结束，双曲群，即直角Coxeter群定义的广义θ-图和循环的广义θ-图，和几何汞齐的自由群的JSJ图是树的直径最多为4。我们还证明了如果自由群的几何混合有一棵树的JSJ图，则它可与直角Coxeter群相交，并给出了一个自由群的几何混合不与任何由扭元生成的群拟等距（因而不可相交）的例子.我们的证明涉及一个新的几何实现的直角Coxeter群，我们认为，使覆盖对应的扭转自由，有限指数子群的表面汞齐。
We completely classify the possible divergence functions for right-angled Coxeter groups (RACGs). In particular, we show that the divergence of any such group is either polynomial, exponential or infinite. We prove that a RACG is strongly thick of order k if and only if its divergence function is a polynomial of degree k+1. Moreover, we show that the exact divergence function of a RACG can easily be computed from its defining graph by an invariant we call the hypergraph index.
This paper introduces a new class of right-angled Coxeter groups with totally disconnected Morse boundaries. We construct this class recursively by examining how the Morse boundary of a right-angled Coxeter group changes if we glue a graph to its defining graph. More generally, we present a method to construct amalgamated free products of CAT(0) groups with totally disconnected Morse boundaries that act geometrically on CAT(0) spaces that have a treelike block decomposition.
Right-angled Coxeter quandles and polyhedral products
对于Coxeter群$W$，人们将量子$X_W$关联起来，从量子$X_W$构造群$\mathrm{Ad}(X_W)$。这个组是$W$和关联的Artin组之间的中间对象。利用Akita的一个结果，证明了$\mathrm{Ad}(X_W)$是由涉及$W$的拉回给出的，并且利用这个拉回，证明了当$W$是直角时，$\mathrm{Ad}(X_W)$的分类空间是由一个称为多面体积的空间给出的.给出了分类空间的这种描述的两个应用。
In this article, given two finite simplicial graphs $Γ_1$ and $Γ_2$, we state and prove a complete description of the possible morphisms $C(Γ_1) \to C(Γ_2)$ between the right-angled Coxeter groups $C(Γ_1)$ and $C(Γ_2)$. As an application, assuming that $Γ_2$ is triangle-free, we show that, if $C(Γ_1)$ is isomorphic to a subgroup of $C(Γ_2)$, then the ball of radius $8|Γ_1||Γ_2|$ in $C(Γ_2)$ contains the basis of a subgroup isomorphic to $C(Γ_1)$. This provides an algorithm determining whether or not, among two given two-dimensional right-angled Coxeter groups, one is isomorphic to a subgroup o…
Outer automorphism groups of right-angled Coxeter groups are either large or virtually abelian
我们推广的概念，一个分离的交叉链接（SIL）给必要和充分的标准上的定义图$Γ$的直角Coxeter组$W_Γ$，使其外部自同构群是大的：也就是说，它包含一个有限的指数子群，承认自由群$F_2$作为商。当$Out(W_Γ)$不是很大时，我们证明了它实际上是阿贝尔的。我们还证明了有限阿贝尔群的图积的外自同构群也具有同样的二分法。因此，这些群具有性质（T）当且仅当它们是有限的，或者等价地$Γ$不包含SIL。
On the Weak Right Order of a Right-Angled Coxeter System
本文证明在任意Coxeter系统中，所有非单位完全交换元素具有祖先性质，特别地，直角Coxeter系统的所有非单位元素满足该性质，并给出了直角Coxeter系统的公理化刻画。
We associate cube complexes called completions to each subgroup of a right-angled Coxeter group (RACG). A completion characterizes many properties of the subgroup such as whether it is quasiconvex, normal, finite-index or torsion-free. We use completions to show that reflection subgroups are quasiconvex, as are one-ended Coxeter subgroups of a 2-dimensional RACG. We provide an algorithm that determines whether a given one-ended, 2-dimensional RACG is isomorphic to some finite-index subgroup of another given RACG. In addition, we answer several algorithmic questions regarding quasiconvex subgro…
Factoriality of Hecke-von Neumann algebras of right-angled Coxeter groups
与参数$q$相关联的Coxter群$W$的Hecke代数$\mathbb{C}_q[W]$可以被完成为von Neumann代数$\mathcal{N}_q(W)$。我们研究了$W$是直角的情况下的代数。我们确定$q$的范围，其中$\mathcal{N}_q(W)$是因子，即具有平凡中心。此外，在非平凡中心的情况下，我们证明了一个结果，允许分解$\mathcal{N}_q(W)$到一个有限的直和的因素。
Let $W$ be a right-angled Coxeter group corresponding to a finite non-discrete graph $\mathcal{G}$ with at least $3$ vertices. Our main theorem says that $\mathcal{G}^c$ is connected if and only if for any infinite index quasiconvex subgroup $H$ of $W$ and any finite subset $\{ γ_1, \ldots , γ_n \} \subset W \setminus H$ there is a surjection $f$ from $W$ to a finite alternating group such that $f (γ_i) \notin f (H)$. A corollary is that a right-angled Artin group splits as a direct product of cyclic groups and groups with many alternating quotients in the above sense. Similarly, finitely gene…
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