Results 61 to 70 of about 633 (85)

Spectral Properties of n-perinormal operators

, 2012
In this paper we study spectral properties of class (M,n) or n -perinormal operators. It is shown that if T belongs to class (M,n) , then its point spectrum and joint point spectrum are identical.
S. Mécheri, N. Braha
semanticscholar   +1 more source

On Quasi-Normality of Two-Sided Multiplication [PDF]

, 2009
2000 Mathematics Subject Classification: 47B47, 47B10, 47A30.In this note, we characterize quasi-normality of two-sided multiplication, restricted to a norm ideal and we extend this result, to an important class which contains all quasi-normal operators.
Amouch, M.
core  

$L^p$-boundedness and $L^p$-nuclearity of multilinear pseudo-differential operators on $\mathbb{Z}^n$ and the torus $\mathbb{T}^n$

, 2019
In this article, we begin a systematic study of the boundedness and the nuclearity properties of multilinear periodic pseudo-differential operators and multilinear discrete pseudo-differential operators on $L^p$-spaces. First, we prove analogues of known
Cardona, Duván, Kumar, Vishvesh
core   +2 more sources

An operator extension of the parallelogram law and related norm inequalities [PDF]

, 2010
We establish a general operator parallelogram law concerning a characterization of inner product spaces, get an operator extension of Bohr's inequality and present several norm inequalities.
Moslehian, Mohammad Sal
core  

MIMO capacity for deterministic channel models: sublinear growth

, 2012
This is the second paper of the authors in a series concerned with the development of a deterministic model for the transfer matrix of a MIMO system. Starting from the Maxwell equations, we have described in \cite{BCFM} the generic structure of such a ...
Almers, Bentosela, Bentosela, Foschini, Gesbert, Hörmander, Molisch, Paulraj, Poon, Telatar, Wei   +10 more
core   +3 more sources

Non positively curved metric in the space of positive definite infinite matrices [PDF]

, 2007
We introduce a Riemannian metric with non positive curvature in the (infinite dimensional) manifold Σ∞ of positive invertible operators of a Hilbert space H, which are scalar perturbations of Hilbert-Schmidt operators.
Andruchow, Esteban, Varela, Alejandro
core  

Spectral characterization of sums of commutators II

, 1997
For countably generated ideals, $\Jc$, of $B(\Hil)$, geometric stability is necessary for the canonical spectral characterization of sums of $(\Jc,B(\Hil))$--commutators to hold. This answers a question raised by Dykema, Figiel, Weiss and Wodzicki. There
Dykema, Kenneth J., Kalton, Nigel J.
core   +3 more sources

The diameter of the Birkhoff polytope

Special Matrices
The geometry of the compact convex set of all n×nn\times n doubly stochastic matrices, a structure frequently referred to as the Birkhoff polytope, has been an active subject of research as of late.
Bouthat Ludovick, Mashreghi Javad, Morneau-Guérin Frédéric   +2 more
doaj   +1 more source

Grothendieck's inequality and applications

, 2011
We give a small survey in connection with the famous Grothendieck’s inequality. We consider some classical applications, an application to the geometry of Banach spaces as well as applications to the well known problem of whether the Sp -algebras with ...
O. Reinov
semanticscholar   +1 more source

Generalized D-Symmetric Operators I [PDF]

, 2008
2000 Mathematics Subject Classification: Primary: 47B47, 47B10; secondary 47A30.Let H be an infinite-dimensional complex Hilbert space and let A, B ∈ L(H), where L(H) is the algebra of operators on H into itself.
Bouali, S., Ech-chad, M.
core