Results 21 to 30 of about 127 (43)

A bound for the Hilbert-Schmidt norm of generalized commutators of nonself-adjoint operators

, 2017
Let A, à and B be bounded linear operators in a Hilbert space, and f (z) be a function regular on the convex hull of the union of the spectra of A and à . Let SN2 be the ideal of Hilbert-Schmidt operators.
M. Gil'
semanticscholar   +1 more source

A NOTE ON P-SYMMETRIC OPERATORS

, 2016
Let L(H) denote the algebra of operators on a complex infinite dimensional Hilbert space H into itself. In this paper, we study the class of operators A ∈ L(H) which satisfy the following property, AT = TA implies AT ∗ = T ∗A for all T ∈ C1(H) (trace ...
S. Bouali, M. Ech-Had, A. Zouaki, Y. Bouhafsi   +3 more
semanticscholar   +1 more source

Fuglede-Putnam's theorem for w-hyponormal operators

, 2012
An asymmetric Fuglede-Putnam’s Theorem for w -hyponormal operators and dominant operators is proved, as a consequence of this result, we obtain that the range of the generalized derivation induced by the above classes of operators is orthogonal to its ...
A. Bachir, F. Lombarkia
semanticscholar   +1 more source

About instability in an elastic Cosserat body with pores

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica
This article is centered on the study of the isotropic, porous Cosserat elastic media, realized by means of a parallel with the media of the same type, but anisotropic, by following the rewriting in a new form of the equations that govern this theory ...
Codarcea-Munteanu L., Marin M., Abouelregal A. E.   +2 more
doaj   +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  

On the Range and the Kernel of Derivations [PDF]

, 2006
2000 Mathematics Subject Classification: Primary 47B47, 47B10; Secondary 47A30.Let H be a separable infinite dimensional complex Hilbert space and let L(H) denote the algebra of all bounded linear operators on H into itself.
Bouali, Said, Bouhafsi, Youssef
core  

On Minimizing ||S−(AX−XB)||Pp [PDF]

, 2000
In this paper, we minimize the map Fp (X)= ||S−(AX−XB)||Pp , where the pair (A, B) has the property (F P )Cp , S ∈ Cp , X varies such that AX − XB ∈ Cp and Cp denotes the von Neumann-Schatten ...
Mecheri, Salah
core  

Some new bounds for the generalized triangle inequality

, 2012
In this paper we present some new inequalities in normed linear spaces which much improve the triangle inequality. Our results refine and generalize the corresponding ones obtained by Mitani et al.
H. Dehghan
semanticscholar   +1 more source

On the metrizability of suprametric space

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica
The question of metrizability of suprametric space is answered positively. The observed metric coincides with a suprametric in a way that convergence and continuity are preserved between suprametric space and associated metric space along with the ...
Karapınar Erdal, Cvetković Marija
doaj   +1 more source

Generalized finite operators and orthogonality

SUT Journal of Mathematics, 2011
In this paper we prove that a spectraloid operator is finite, we present some generalized finite operators and we give a new class of finite op- erators. Also, the orthogonality of some operators is studied.
S. Bouzenada
semanticscholar   +1 more source