Results 41 to 50 of about 396 (56)

Weyl's Theorem for Class A Operators

, 2001
A. Uchiyama
semanticscholar   +1 more source

A note on the index of $B$-Fredholm operators

, 2004
M. Berkani, D. Medková
semanticscholar   +1 more source

Invertibility and Fredholmness of linear combinations of quadratic, k-potent and nilpotent operators

, 2008
Hwa-Long Gau, Chih-Jen Wang, N. Wong
semanticscholar   +1 more source

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Operators

The Python Book, 2022
. Erratum/Addendum to the paper Powers of posinormal operators , Operators and Matrices 10 (2016), 15–27. Mathematics subject classi fi cation (2020): Primary 47B20; Secondary 47A53.
C. S. K. Ubrusly, P. C. M. V. Ieira, J. Anni   +2 more
semanticscholar   +1 more source

A new Browder type property

, 2020
In this paper, a new class of operators (Jbv) satisfying a new spectral property (Bv) of Browder type is defined. This property is shown to be stronger than the Browder type properties (az), (ah), (Sab), (Sb), (VΠ), (VΠa) and Weyl type properties (z), (v)
N. Jayanthi, P. Vasanthakumar
semanticscholar   +1 more source

Stability of essential spectra of closed operators under T-compact equivalence and applications

SERIES III - MATEMATICS, INFORMATICS, PHYSICS, 2019
The main subject of this paper is to introduce and study the concept of T -compact equivalence of closed linear operators in Hilbert spaces. Many results are proved via this equivalence, especially the invariance of essential spectra of T -compact ...
N. Khaldi, B. Messirdi
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On Some Properties of Spectra and Essential Spectra in Banach Spaces

Sarajevo Journal of Mathematics
In this paper, we study diverse properties satisfied by the spectra, Wolf and Weyl essential spectra of bounded linear operators and their links with the structures of Banach spaces.   2010 Mathematics Subject Classification.
Abdelkader Dehici
semanticscholar   +1 more source

Perturbating Upper Semi-fredholm With Strictly Singular Operators

Sarajevo Journal of Mathematics
Given an upper semi-Fredholm operator $L$, following the work of P. Cassaza and N. Kalton [1] and others, we introduce and study a set of upper semi-Fredholm operators having the same index as $L$ and which is invariant under strictly singular ...
Fernando Galaz-Fontes
semanticscholar   +1 more source

Some properties of the essential numerical range on Banach spaces

, 2017
L. Muhati, J. Bonyo, J. O. Agure
semanticscholar   +1 more source

Weyl's theorem and property (Saw)

, 2018
N. Jayanthi
semanticscholar   +1 more source