Results 21 to 30 of about 72 (43)

Remarks on Jordan derivations over matrix algebras [PDF]

arXiv, 2018
Let C be a commutative ring with unity. In this article, we show that every Jordan derivation over an upper triangular matrix algebra T_n(C) is an inner derivation. Further, we extend the result for Jordan derivation on full matrix algebra M_n(C).
arxiv  

Lie n-multiplicative mapping on Triangular n-Matrix Rings [PDF]

arXiv, 2018
In this paper we extend to triangular n-matrix rings and Lie n-multiplicative map a result about Lie multiplicative maps on triangular algebras due to Xiaofei Qi and Jinchuan Hou.
arxiv  

Spectral synthesis and masa-bimodules [PDF]

arXiv, 2002
Generalizing a result of Arveson on finite width CSL algebras, we prove that finite width masa-bimodules satisfy spectral synthesis. Introducing a new class of masa-bimodules, we show that there exists a non-synthetic masa-bimodule, such that the maximal algebras over which it is a bimodule, are synthetic.
arxiv  

The Stable Ideals of a Continuous Nest Algebra II [PDF]

J. Operator Theory, 57 (1), 2007, 67 - 94, 2005
We continue the study of the rich family of norm-closed, automorphism invariant ideals of a continuous nest algebra. First we present a unified framework which captures all stable ideals as the kernels of limits of diagonal compressions. We then characterize when two such limits give rise to the same ideal, and we obtain detailed information of the ...
arxiv  

Partial Crossed Product Presentations For $O_n$ and $M_k(O_n)$ Using Amenable Groups [PDF]

arXiv, 2006
The Cuntz algebra O_n is presented as a partial crossed product in which an amenable group partially acts on an abelian C*-algebra. The partial action is related to the Cuntz groupoid for O_n and connections are made with non-self-adjoint subalgebras of O_n, particularly the Volterra nest subalgebra.
arxiv  

The Maximal Two-Sided Ideals of Nest Algebras [PDF]

J. Operator Theory, 73, (2), 2015, 407-416, 2014
We give a necessary and sufficient criterion for an operator in a nest algebra to belong to a proper two-sided ideal of that algebra. Using this result, we describe the strong radical of a nest algebra, and give a general description of the maximal two-sided ideals.
arxiv  

Jordan Derivations of Incidence Algebras [PDF]

arXiv, 2014
Let $\mathcal{R}$ be a commutative ring with identity, $I(X,\mathcal{R})$ be the incidence algebra of a locally finite pre-ordered set $X$. In this note, we characterise the derivations of $I(X,\mathcal{R})$ and prove that every Jordan derivation of $I(X,\mathcal{R})$ is a derivation provided that $\mathcal{R}$ is $2$-torsion free.
arxiv  

Compact multiplication operators on nest algebras [PDF]

arXiv, 2016
Let N be a nest on a Hilbert space H and AlgN the corresponding nest algebra. We obtain a characterization of the compact and weakly compact multiplication operators defined on nest algebras. This characterization leads to a description of the closed ideal generated by the compact elements of AlgN . We also show that there is no non-zero weakly compact
arxiv  

Lie Derivations of Incidence Algebras [PDF]

arXiv, 2016
Let $X$ be a locally finite preordered set, $\mathcal R$ a commutative ring with identity and $I(X,\mathcal R)$ the incidence algebra of $X$ over $\mathcal R$. In this note we prove that each Lie derivation of $I(X,\mathcal R)$ is proper, provided that $\mathcal R$ is $2$-torsion free.
arxiv  

Jordan {g, h}-derivations on algebra of matrices [PDF]

arXiv, 2018
In this article, we show that every Jordan {g, h}-derivation over T_n(C) is a {g, h}-derivation under an assumption, where C is a commutative ring with unity 1 not equal to 0. We give an example of a Jordan {g, h}-derivation over T_n(C) which is not a {g, h}-derivation. Also, we study Jordan {g, h}-derivation over M_n(C).
arxiv