Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Hassan Zariouh"'
Publikováno v:
Mathematica Bohemica, Vol 141, Iss 1, Pp 99-108 (2016)
We study the stability of a-Browder-type theorems for orthogonal direct sums of operators. We give counterexamples which show that in general the properties $(\rm SBaw)$, $(\rm SBab)$, $(\rm SBw)$ and $(\rm SBb)$ are not preserved under direct sums o
Externí odkaz:
https://doaj.org/article/982976536c8640d48a3ea977a36b390d
Autor:
Zakariae Aznay, Hassan Zariouh
Publikováno v:
Rendiconti del Circolo Matematico di Palermo Series 2. 72:1363-1376
Autor:
Zakariae Aznay, Hassan Zariouh
Publikováno v:
Linear and Multilinear Algebra. 70:5913-5921
In this paper, we continue the study of property $(UW_{\Pi})$ introduced in \cite{berkani2}, in connection with other Weyl type theorems. Moreover, we give counterexamples to show that some recent results related to this property, which are announced
Autor:
kaoutar Ben Ouidren, Hassan Zariouh
Publikováno v:
Linear and Multilinear Algebra. 70:3231-3247
In this paper, we study the properties ( b z ) and ( w π 00 a ) , which we had introduced in [Ben Ouidren K, Zariouh H. New approach to a-Weyl's theorem and some preservation results. Rend Circ Mat...
Autor:
Hassan Zariouh
Publikováno v:
Rendiconti del Circolo Matematico di Palermo Series 2. 67:233-240
We study the stability of the spectral property (k) introduced and studied by Kaushik and Kashyap (Int J Math Arch 12:167–171, 2014), under commuting perturbations by Riesz operators, and we give generalizations of some known results.
Autor:
Hassan Zariouh
Publikováno v:
Rendiconti del Circolo Matematico di Palermo (1952 -). 65:323-331
The paper introduces the notion of properties $$(Z_{\Pi _{a}})$$ and $$(Z_{E_{a}})$$ as variants of Weyl’s theorem and Browder’s theorem for bounded linear operators acting on infinite dimensional Banach spaces. A characterization of these proper
Publikováno v:
Demonstratio Mathematica, Vol 47, Iss 2, Pp 411-422 (2014)
In this paper, we study the stability of extended Weyl and Browdertype theorems for orthogonal direct sum S⊕T, where S and T are bounded linear operators acting on Banach space. Two counterexamples shows that property (ab), in general, is not prese
Publikováno v:
Sarajevo Journal of Mathematics. 9:271-281
We introduce and we study the new spectral properties (SBw), (SBaw), (SBab) and (SBb). Among other results, we show that if T is a bounded linear operator acting on a Banach space X, then T possesses property (SBb) if and only if T possesses property
Autor:
Hassan Zariouh, Mohammed Berkani
Publikováno v:
Bulletin of the Korean Mathematical Society. 49:1027-1040
The aim of this paper is to study the Weyl type-theorems for the orthogonal direct sum S T, where S and T are bounded linear operators acting on a Banach space X. Among other results, we prove that if both T and S possesses property (gb) and if ( T)
Publikováno v:
Mediterranean Journal of Mathematics. 8:399-409
We study the new properties (b) and (gb), which we had introduced in [13], for an operator having the SVEP on the complement of distinguished parts of its spectrum. Classes of operators are considered as illustrating examples.