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Related papers: Characterisations for uniform amenability

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We continue the investigation of notions of approximate amenability that were introduced in work of the second and third authors. It is shown that every boundedly approximately contractible Banach algebra has a bounded approximate identity.…

Functional Analysis · Mathematics 2009-03-26 Y. Choi , F. Ghahramani , Y. Zhang

We study relative amenability and amenability of a right coideal $\widetilde{N}_P\subseteq \ell^\infty(\mathbb{G})$ of a discrete quantum group in terms of its group-like projection $P$. We establish a notion of a $P$-left invariant state…

Operator Algebras · Mathematics 2023-08-04 Benjamin Anderson-Sackaney

Weak amenability of discrete groups was introduced by Haagerup and co-authors in the 1980's. It is an approximation property known to be stable under direct products and free products. In this paper we show that graph products of weakly…

Group Theory · Mathematics 2017-06-28 Eric Reckwerdt

In this paper, we introduce a weak form of amenability on topological semigroups that we call $\varphi$-amenability, where $\varphi$ is a character on a topological semigroup. Some basic properties of this new notion are obtained and by…

Functional Analysis · Mathematics 2020-05-19 Ali Jabbari , Ali Ebadian , Madjid Eshaghi Gordji

We introduce the weak Haagerup property for locally compact groups and prove several hereditary results for the class of groups with this approximation property. The class contains a priori all weakly amenable groups and groups with the…

Operator Algebras · Mathematics 2016-09-19 Søren Knudby

In this article we extend independent results of Lusztig and H\'ezard concerning the existence of irreducible characters of finite reductive groups, (defined in good characteristic and arising from simple algebraic groups), satisfying a…

Representation Theory · Mathematics 2014-04-01 Jay Taylor

We establish a close link between the amenability of a unitary representation $\pi$ of a group $G$ (in the sense of Bekka) and the concentration property (in the sense of V. Milman) of the corresponding dynamical system $(\s_\pi,G)$, where…

Functional Analysis · Mathematics 2007-09-03 Vladimir G. Pestov

Given a Fell bundle $\B$, over a discrete group $\Gamma$, we construct its reduced cross sectional algebra $C^*_r(\B)$, in analogy with the reduced crossed products defined for C*-dynamical systems. When the reduced and full cross sectional…

funct-an · Mathematics 2008-02-03 Ruy Exel

We give a definition of amenability at infinity for a locally compact, $\sigma$-compact and Hausdorff etale groupoid and we study in some case the exactness of the reduced $C^*$-algebra of a such groupoid.

Operator Algebras · Mathematics 2014-10-31 Ivan Lassagne

Recall that a definable group is `definably amenable' if it admits a translation-invariant Keisler measure. We prove a combinatorial characterization of definable amenability for groups definable in NIP theories. More specifically, given a…

Logic · Mathematics 2025-11-20 Atticus Stonestrom

In this paper we consider the class of connected simple Lie groups equipped with the discrete topology. We show that within this class of groups the following approximation properties are equivalent: (1) the Haagerup property; (2) weak…

Group Theory · Mathematics 2016-09-19 Søren Knudby , Kang Li

We consider the Fourier-Stietljes algebra B(G) of a locally compact group G. We show that operator amenablility of B(G) implies that a certain semitolpological compactification of G admits only finitely many idempotents. In the case that G…

Operator Algebras · Mathematics 2018-06-25 Nico Spronk

Three natural definitions for amenability of general Hopf C^*-algebras (all of them being generalizations of the case of locally compact groups) were given and the relations between them were studied. Moreover, amenability in the situation…

Operator Algebras · Mathematics 2007-05-23 Chi-Keung Ng

We define a family of groups that generalises Thompson's groups $T$ and $G$ and also those of Higman, Stein and Brin. For groups in this family we descrine centralisers of finite subgroups and show, that for a given finite subgroup $Q$,…

Group Theory · Mathematics 2013-09-10 Conchita Martinez-Perez , Brita E. A. Nucinkis

A complete characterization of Hilbert space operators that generate weakly amenable algebras remains open, even in the case of compact operator. Farenick, Forrest and Marcoux proposed the question that if $T$ is a compact weakly amenable…

Functional Analysis · Mathematics 2010-09-01 Luo Yi Shi , YU Jing Wu , You Qing Ji

We consider an action of a countable amenable group on a compact metric space, focusing on the set of generic points with respect to a fixed F{\o}lner sequence. For a given characteristic class, we prove that the set of points that are…

Dynamical Systems · Mathematics 2025-10-31 Sejal Babel , Martha Łącka , Marcel Mroczek

We prove that a Banach space has the uniform approximation property with proportional growth of the uniformity function iff it is a weak Hilbert space.

Functional Analysis · Mathematics 2008-02-03 William B. Johnson , Gilles Pisier

In this note, we frst consider boundedness properties of a family of operators generalizing the Hilbert operator in the upper triangle case. In the diagonal case, we give the exact norm of these operators under some restrictions on the…

Classical Analysis and ODEs · Mathematics 2016-01-11 Justice S. Bansah , Benoit F. Sehba

We survey results from amenability theory with an emphasis on applications to harmonic analysis on direct-limit groups.

Representation Theory · Mathematics 2015-10-28 Matthew Dawson , Gestur Ólafsson

We introduce the notion of amenability for affine algebras. We characterize amenability by Folner-sequences, paradoxicality and the existence of finitely invariant dimension-measures. Then we extend the results of Rowen on ranks, from…

Rings and Algebras · Mathematics 2007-05-23 Gabor Elek
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