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We obtain a homological characterisation of virtually free-by-cyclic groups among groups that are hyperbolic and virtually compact special. As a consequence, we show that many groups known to be coherent actually possess the stronger…

Group Theory · Mathematics 2024-06-28 Dawid Kielak , Marco Linton

Let G be a group acting geometrically on a CAT(0) cube complex X. We prove first that G is hyperbolic relative to the collection P of subgroups if and only if the simplicial boundary of X is the disjoint union of a nonempty discrete set,…

Group Theory · Mathematics 2016-06-15 Jason Behrstock , Mark F. Hagen

We show that low-density random quotients of cubulated hyperbolic groups are again cubulated (and hyperbolic). Ingredients of the proof include cubical small-cancellation theory, the exponential growth of conjugacy classes, and the…

Group Theory · Mathematics 2024-03-19 David Futer , Daniel T. Wise

The aim of this short note is to provide a proof of the decidability of the generalized membership problem for relatively quasi-convex subgroups of finitely presented relatively hyperbolic groups, under some reasonably mild conditions on…

Group Theory · Mathematics 2020-05-27 Olga Kharlampovich , Pascal Weil

We show that if a group is not virtually cyclic and is hyperbolic relative to a family of proper subgroups, then it has a hyperbolically embedded subgroup which contains a finitely generated non-abelian free group as a finite index…

Group Theory · Mathematics 2012-05-23 Yoshifumi Matsuda , Shin-ichi Oguni , Saeko Yamagata

We introduce the bounded packing property for a subgroup of a countable discrete group G. This property gives a finite upper bound on the number of left cosets of the subgroup that are pairwise close in G. We establish basic properties of…

Group Theory · Mathematics 2014-11-11 G. Christopher Hruska , Daniel T. Wise

We show that a group that is hyperbolic relative to strongly shortcut groups is itself strongly shortcut, thus obtaining new examples of strongly shortcut groups. The proof relies on a result of independent interest: we show that every…

Group Theory · Mathematics 2023-10-24 Nima Hoda , Suraj Krishna M S

We give a classification of integral lattices with virtually abelian symmetry group. As a consequence, we complete the classification of K3 surfaces with virtually abelian automorphism group. In the appendix we formulate an algorithm for…

Algebraic Geometry · Mathematics 2025-07-29 Simon Brandhorst , Markus Kirschmer , Giacomo Mezzedimi

We start with a Gromov-hyperbolic surface bundle $E$ over a graph, and drill out essential simple closed curves from fibers to obtain a drilled bundle $F$. We prove that for such drilled bundles $F$, the fundamental group $\pi_1(F)$ is…

Group Theory · Mathematics 2025-11-05 Mahan Mj , Biswajit Nag

We provide an analogue of Strebel's classification of geodesic triangles in classical $C'(\frac16)$ groups for groups given by Wise's cubical presentations satisfying sufficiently strong metric cubical small cancellation conditions. Using…

Group Theory · Mathematics 2022-11-02 Goulnara N. Arzhantseva , Mark F. Hagen

Let $G$ be a group that is relatively hyperbolic with respect to a collection of subgroups $\{H_{\lambda}\}_{\lambda\in \Lambda}$. Suppose that $G$ is given by a finite relative presentation $\mathcal{P}$ with respect to this collection. We…

Group Theory · Mathematics 2025-01-09 Oleg Bogopolski

We investigate the algebraic K- and L-theory of the group ring RG, where G is a hyperbolic or virtually finitely generated abelian group and R is an associative ring with unit.

K-Theory and Homology · Mathematics 2012-05-16 Wolfgang Lueck , David Rosenthal

We prove that finitely generated relatively hyperbolic groups are bi-exact if and only if all peripheral subgroups are bi-exact. This is a generalization of Ozawa's result which claims that finitely generated relatively hyperbolic groups…

Group Theory · Mathematics 2024-09-17 Koichi Oyakawa

Suppose that all hyperbolic groups are residually finite. The following statements follow: In relatively hyperbolic groups with peripheral structures consisting of finitely generated nilpotent subgroups, quasiconvex subgroups are separable;…

Group Theory · Mathematics 2016-02-17 Jason Fox Manning , Eduardo Martinez-Pedroza

We prove that, for a finitely generated group hyperbolic relative to virtually abelian subgroups, the generalised word problem for a parabolic subgroup is the language of a real-time Turing machine. Then, for a hyperbolic group, we show…

Group Theory · Mathematics 2016-10-07 Laura Ciobanu , Derek Holt , Sarah Rees

We prove that if a group $G$ admits a virtually special action on a CAT(0) cube complex, then any product of convex-cocompact subgroups of $G$ is separable. Previously, this was only known for products of three subgroups, or in the case…

Group Theory · Mathematics 2025-12-16 Sam Shepherd

We prove that the class of convex-cocompact Kleinian groups is quasi-isometrically rigid. We also establish that a word hyperbolic group with a planar boundary different from the sphere is virtually a convex-cocompact Kleinian group…

Group Theory · Mathematics 2014-05-26 Peter Haïssinsky

We develop the foundations of the theory of relatively geometric actions of relatively hyperbolic groups on CAT(0) cube complexes, a notion introduced in our previous work [5]. In the relatively geometric setting we prove: full relatively…

Group Theory · Mathematics 2022-03-09 Eduard Einstein , Daniel Groves

We show that the mapping torus of a hyperbolic group by a hyperbolic automorphism is cubulable. Along the way, we (i) give an alternate proof of Hagen and Wise's theorem that hyperbolic free-by-cyclic groups are cubulable, and (ii) extend…

Group Theory · Mathematics 2025-01-08 François Dahmani , Suraj Krishna M S , Jean Pierre Mutanguha

We prove the Borel Conjecture for a class of groups containing word-hyperbolic groups and groups acting properly, isometrically and cocompactly on a finite dimensional CAT(0)-space.

Geometric Topology · Mathematics 2010-03-26 Arthur Bartels , Wolfgang Lueck