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We give a new criterion for solvability of group equations, providing proofs of various generalizations of the Kervaire-Laudenbach conjecture for Connes-embeddable groups.

Group Theory · Mathematics 2021-09-27 Martin Nitsche , Andreas Thom

We study generalized Lie bialgebroids over a single point, that is, generalized Lie bialgebras. Lie bialgebras are examples of generalized Lie bialgebras. Moreover, we prove that the last ones can be considered as the infinitesimal…

Differential Geometry · Mathematics 2007-05-23 D. Iglesias , J. C. Marrero

We construct the first example of a finitely-presented, residually-finite group that contains an infinite sequence of non-isomorphic finitely-presented subgroups such that each of the inclusion maps induces an isomorphism of profinite…

Group Theory · Mathematics 2015-01-08 Martin R. Bridson

Say that a finite group $G$ is mixable if a product of random elements, each chosen independently from two options, can distribute uniformly on $G$. We present conditions and obstructions to mixability. We show that $2$-groups, the…

Group Theory · Mathematics 2025-01-30 Gideon Amir , Guy Blachar , Subhajit Ghosh , Uzi Vishne

Trying to finalize in some way the present subject, this paper targets to generalize substantially the notions of Bassian and co-Bassian groups by introducing the so-called finitely (co-)Bassian groups, semi (co-)Bassian groups, fully…

Group Theory · Mathematics 2024-03-14 Andrey R. Chekhlov , Peter V. Danchev , Patrick W. Keef

We construct a finitely generated group that does not satisfy the generalized Burghelea conjecture.

K-Theory and Homology · Mathematics 2019-05-03 A. Dranishnikov , M. Hull

Long and Moody gave a method of constructing representations of the braid group B_n. We discuss some ways to generalize their construction. One of these gives representations of subgroups of B_n, including the Gassner representation of the…

Geometric Topology · Mathematics 2008-07-21 Stephen Bigelow , Jianjun Paul Tian

This paper investigates the finite generation of cluster automorphism groups. By applying the pseudo $\mathbb{N}$-grading introduced in our previous work, we establish a sufficient condition for a cluster automorphism group to be finitely…

Rings and Algebras · Mathematics 2026-05-28 Changjian Fu , Zhanhong Liang , Yinzhi Wang

We survey and compare various generalizations of braid groups for quivers with superpotential and focus on the cluster braid groups, which are introduced in a joint work with A.~King. Our motivations come from the study of cluster algebras,…

Representation Theory · Mathematics 2018-02-27 Yu Qiu

In a previous paper, we developed general techniques for constructing a variety of pseudo-collars, as defined by Guilbault and Tinsley, with roots in earlier work by Chapman and Siebenmann. As an application of our techniques, we exhibited…

Geometric Topology · Mathematics 2021-10-26 Jeffrey Rolland

We introduce a rich family of generalizations of the pentagram map sharing the property that each generates an infinite configuration of points and lines with four points on each line. These systems all have a description as $Y$-mutations…

Dynamical Systems · Mathematics 2017-05-17 Max Glick , Pavlo Pylyavskyy

This paper provides a realization of all classical and most exceptional finite groups of Lie type as Galois groups over function fields over F_q and derives explicit additive polynomials for the extensions. Our unified approach is based on…

Group Theory · Mathematics 2015-10-29 Maximilian Albert , Annette Maier

We provide new computations in bounded cohomology: A group is boundedly acyclic if its bounded cohomology with trivial real coefficients is zero in all positive degrees. We show that there exists a continuum of finitely generated…

Group Theory · Mathematics 2022-10-24 Francesco Fournier-Facio , Clara Loeh , Marco Moraschini

We use groups with triality to construct a series of nonassociative Moufang loops. Certain members of this series contain an abelian normal subloop with the corresponding quotient being a cyclic group. In particular, we give a new series of…

Group Theory · Mathematics 2013-05-16 Alexander N. Grishkov , Andrei V. Zavarnitsine

We study fundamental groups of non compact Riemannian manifolds. We find conditions which ensure that the fundamental group is trivial, finite or finitely generated.

Differential Geometry · Mathematics 2007-05-23 Nader Yeganefar

For each infinite series of the classical Lie groups of type B,C or D, we introduce a family of polynomials parametrized by the elements of the corresponding Weyl group of infinite rank. These polynomials represent the Schubert classes in…

Combinatorics · Mathematics 2022-04-05 Takeshi Ikeda , Leonardo C. Mihalcea , Hiroshi Naruse

Moufang sets were introduced by Jacques Tits in order to understand isotropic linear algebraic groups of relative rank one, but the notion is more general. We describe a new class of Moufang sets, arising from so-called mixed groups of type…

Group Theory · Mathematics 2014-05-20 Elizabeth Callens , Tom De Medts

We exhibit new examples of double quasi-Poisson brackets, based on some classification results and the method of fusion. This method was introduced by Van den Bergh for a large class of double quasi-Poisson brackets which are said…

Quantum Algebra · Mathematics 2022-08-24 Maxime Fairon

Cluster categories have been introduced by Buan, Marsh, Reineke, Reiten and Todorov in order to categorify Fomin-Zelevinsky cluster algebras. This survey motivates and outlines the construction of a generalization of cluster categories, and…

Representation Theory · Mathematics 2011-11-21 Claire Amiot

We construct first examples of infinite groups having property (T) whose Kazhdan constants admit a lower bound independent of the choice of a finite generating set.

Group Theory · Mathematics 2007-05-23 D. Osin , D. Sonkin