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Related papers: Popa algebras in free group factors

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As an instance of a linear action of a Hopf algebra on a free associative algebra, we consider finite group gradings of a free algebra induced by gradings on the space spanned by the free generators. The homogeneous component corresponding…

Rings and Algebras · Mathematics 2008-11-12 Vitor O. Ferreira , Lucia S. I. Murakami

For an inclusion of the form $\Bbb C\subseteq M_n(\Bbb C)$, where $M_n(\Bbb C)$ is endowed with a state with diagonal weights $\lambda=(\lambda_1, ..., \lambda_n)$, we use Popa's construction, for non-tracial states, to obtain an…

Operator Algebras · Mathematics 2007-05-23 Florin G. Radulescu

In this paper we describe the amalgamated free product of two hyperfinite von Neumann algebras over a finite dimensional subalgebra. In general the free product is a finite direct sum of interpolated free group factors and a hyperfinite von…

Operator Algebras · Mathematics 2011-10-26 Ken Dykema , Daniel Redelmeier

We introduce a new iterative amalgamated free product construction of II$_1$ factors, and use it to construct a separable II$_1$ factor which does not have property Gamma and is not elementarily equivalent to the free group factor…

Operator Algebras · Mathematics 2023-06-01 Ionut Chifan , Adrian Ioana , Srivatsav Kunnawalkam Elayavalli

Various subsets of the tracial state space of a unital C*-algebra are studied. The largest of these subsets has a natural interpretation as the space of invariant means. II_1-factor representations of a class of C*-algebras considered by…

Operator Algebras · Mathematics 2007-05-23 Nathanial P. Brown

We prove that an amalgamated free product of separable commutative C*-algebras is residually finite-dimensional.

Operator Algebras · Mathematics 2012-06-22 A. Korchagin

In this paper we examine bases for finite index inclusion of $II_1$ factors and connected inclusion of finite dimensional $C^*$- algebras. These bases behave nicely with respect to basic construction towers. As applications we have studied…

Operator Algebras · Mathematics 2015-09-09 Keshab Chandra Bakshi

In this paper we discuss the relationship between direct products of monounary algebras and their components, with respect to the properties of residual finiteness, strong/weak subalgebra separability, and complete separability. For each of…

Rings and Algebras · Mathematics 2021-03-26 Bill de Witt

Given reduced amalgamated free products of C$^*$-algebras, $(A,phi)=*_i(A_i,phi_i)$ and $(D,psi)=*_i(D_i,psi_i)$, an embedding $A\to D$ is shown to exist assuming there are conditional expectation preserving embeddings $A_i\to D_i$. This…

Operator Algebras · Mathematics 2007-05-23 Etienne Blanchard , Ken Dykema

To every subfactor planar algebra was associated a II_1 factor with a canonical abelian subalgebra generated by the cup tangle. Using Popa's approximative orthogonality property, we show that this cup subalgebra is maximal amenable.

Operator Algebras · Mathematics 2016-01-20 Arnaud Brothier

Given a partially ordered set $P$ there exists the most general Boolean algebra $F(P)$ which contains $P$ as a generating set, called the {\it free Boolean algebra} over $P$. We study free Boolean algebras over posets of the form $P=P_0\cup…

General Topology · Mathematics 2012-10-23 Robert Bonnet , Latifa Faouzi , Wiesław Kubiś

In this paper we show various new structural properties of free group factors using the recent resolution (due independently to Belinschi-Capitaine and Bordenave-Collins) of the Peterson-Thom conjecture. These results include the resolution…

Operator Algebras · Mathematics 2025-06-18 Ben Hayes , David Jekel , Srivatsav Kunnawalkam Elayavalli

An algebra $A$ is said to be directly finite if each left invertible element in the (conditional) unitization of $A$ is right invertible. We show that the reduced group ${\rm C}^\ast$-algebra of a unimodular group is directly finite,…

Functional Analysis · Mathematics 2015-07-30 Yemon Choi

Certain reduced free products of C*-algebras, (A,phi)=(A_1,phi_1)*(A_2,\phi_2), taken with respect to faithful states, at least one of which is not a trace, are shown to be purely infinite and simple. It is assumed that one of the A_i…

Operator Algebras · Mathematics 2007-05-23 Ken Dykema

We investigate free products of finite dimensional $C^*$-algebras with amalgamation over diagonal subalgebras. We look to determine under what circumstances a given free product is exact and/or nuclear. In some cases we find a description…

Operator Algebras · Mathematics 2013-07-23 Benton L. Duncan

There has been considerable interest in recent decades in questions of random generation of finite and profinite groups, and finite simple groups in particular. In this paper we study similar notions for finite and profinite associative…

Rings and Algebras · Mathematics 2024-02-21 Damian Sercombe , Aner Shalev

Given a finite dimensional algebra $\Lambda$, we show that a frequently satisfied finiteness condition for the category ${\cal P}^{\infty}(\Lambda\rm{-mod})$ of all finitely generated (left) $\Lambda$-modules of finite projective dimension,…

Representation Theory · Mathematics 2014-07-10 B. Huisgen-Zimmermann , S. O. Smalø

A C*-algebra (or a group) is called MF (matricial field) if it admits finite dimensional approximate unitary representations which are approximately injective, where approximately is meant with respect to the operator norm. It is proved…

Operator Algebras · Mathematics 2026-03-24 Tatiana Shulman

Using various finite dimensional approximation properties, four convex subsets of the tracial space of a unital C*-algebra are defined. Applications of these tracial invariants include: (1) An analogue of Szego's limit theorem for arbitrary…

Operator Algebras · Mathematics 2007-05-23 Nathanial P. Brown

We obtain an estimate of free entropy of generators in a type ${II}_1$-factor $\mc{M}$ which has a subfactor $\mc{N}$ of finite index with a subalgebra $\mc{P}=\mc{P}_1\vee\mc{P}_2\subset\mc{N}$ where $\mc{P}_1=\mc{R}_1'\cap\mc{P}$,…

Operator Algebras · Mathematics 2007-05-23 Marius Stefan