Results 11 to 20 of about 4,674,369 (143)
Essential Spectrum for Maxwell’s Equations [PDF]
Annales Henri Poincaré, 2019 22 ...
Alberti, Giovanni S. +6 more
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The Weyl essential spectrum [PDF]
Proceedings of the American Mathematical Society, 1971 Using a modest geometric hypothesis the main theorem of these results classifies the Weyl essential spectrum and the Browder essential spectrum according to the standard terminology for the spectrum of a Hilbert space operator.
Richard Bouldin
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Selector for the Spectrum Award 2018
, 2018 Billingham was invited to be part of the selection panel for the first Spectrum Award in 2018 alongside Mark Wallinger, Charming Baker, Professor Simon Baron-Cohen, Sacha Craddock and Mary Simpson.
Billingham, Richard, Spectrum
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Editorial Note: Impact of COVID-19 on Spectrum operations
, 2020 To support our authors, reviewers and editors during the COVID-19 pandemic, the Spectrum Editorial Board has relaxed its timelines for the publication of this most recent issue (Issue 5). We are working with our authors on their Issue 5 submissions,
Editorial Board, Spectrum
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, 1979 Inaugural issue of Spectrum literary magazinehttps://nwcommons.nwciowa.edu/spectrum/1000/thumbnail ...
Spectrum Contributors,
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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
doaj +1 more source
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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Information reuse in dynamic spectrum access [PDF]
, 2013 Dynamic spectrum access (DSA), where the permission to use slices of radio spectrum is dynamically shifted (in time an in different geographical areas) across various communications services and applications, has been an area of interest from technical ...
Tipper, D +8 more
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