Results 11 to 20 of about 822,201 (162)
Essential Spectrum Due to Singularity [PDF]
Journal of Nonlinear Mathematical Physics, 2003 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kurasov, Pavel, Naboko, Serguei
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Essential Spectrum for Maxwell’s Equations [PDF]
Annales Henri Poincaré, 2019 22 ...
Alberti, Giovanni S. +6 more
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Ascent spectrum and essential ascent spectrum [PDF]
Studia Mathematica, 2008 We study the essential ascent and the related essential ascent spectrum of an operator on a Banach space. We show that a Banach spaceX has nite dimension if and only if the essential ascent of every operator on X is nite. We also focus on the stability of the essential ascent spectrum under perturbations, and we prove that an operator F on X has some ...
O. Bel Hadj Fredj +2 more
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Magnetic Dirichlet Laplacian in curved waveguides [PDF]
Opuscula MathematicaFor a two-dimensional curved waveguide, it is well known that the spectrum of the Dirichlet Laplacian is unstable with respect to waveguide deformations. This means that if the waveguide is a straight strip then the spectrum of the Dirichlet Laplacian is
Diana Barseghyan +3 more
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Numerical Calculation of the Essential Spectrum of a Laplacian [PDF]
Experimental Mathematics, 1999 We consider a bounded Rooms and Passages region Ω on which the negative Neumann laplacian (restricted to the orthogonal complement of the constant functions) does not have a compact inverse and hence has an essential spectrum. We try to understand how such spectra may be approximated by results from a sequence of finite-dimensional problems ...
Neuberger, J. W., Renka, R. J.
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The essential spectrum, norm, and spectral radius of abstract multiplication operators
Concrete Operators, 2023 Let EE be a complex Banach lattice and TT is an operator in the center Z(E)={T:∣T∣≤λIfor someλ}Z\left(E)=\left\{T:| T| \le \lambda I\hspace{0.33em}\hspace{0.1em}\text{for some}\hspace{0.1em}\hspace{0.33em}\lambda \right\} of EE. Then, the essential norm ‖
Schep Anton R.
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Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2011 A model operator H associated with the system of three-identical particles on a lattice ℤ3 is considered. The location of the essential spectrum of H is described by the spectrum of the corresponding Friedrichs model, that is, the two-particle and three ...
Tulkin Kh Rasulov
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The Faddeev equation and location of the essential spectrum of a three-particle model operator
Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2011 In this paper a model operator H associated to a system of three-particles on a lattice is considered. The location of the essential spectrum of H is described by the spectrum of channel operators.
Tulkin Kh Rasulov, Askar A Rakhmonov
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Spectral radius of S-essential spectra
Математичні Студії, 2020 In this paper, we study the spectral radius of some S-essential spectra of a bounded linear operator defined on a Banach space. More precisely, via the concept of measure of noncompactness,we show that for any two bounded linear operators $T$ and $S ...
C. Belabbaci
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Broad-Spectrum Antiviral Strategies and Nucleoside Analogues
Viruses, 2021 The emergence or re-emergence of viruses with epidemic and/or pandemic potential, such as Ebola, Zika, Middle East Respiratory Syndrome (MERS-CoV), Severe Acute Respiratory Syndrome Coronavirus 1 and 2 (SARS and SARS-CoV-2) viruses, or new strains of ...
Robert J. Geraghty +2 more
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