Results 81 to 90 of about 141 (138)

Optimal vaccination: various (counter) intuitive examples. [PDF]

J Math Biol, 2023
Delmas JF, Dronnier D, Zitt PA.
europepmc   +1 more source

Static spectra and static families of Fredholm-type operators under tensor product

Arab Journal of Basic and Applied Sciences
In this study, we introduce the static spectrum, the Weyl static families, the upper semi-Fredholm static families, and the Browder static families. These families consist of bounded linear operators parameterized by a scalar variable.
Elvis Aponte
doaj   +1 more source

Existence and stability of solution for time-delayed nonlinear fractional differential equations

Applied Mathematics in Science and Engineering
The objective of this study is to analyze the existence and stability of solutions for a mathematical model of nonlinear systems of time-delayed fractional differential equations involving Atangana-Baleanu-Caputo ([Formula: see text]) fractional ...
Shiferaw Geremew Kebede, Assia Guezane Lakoud   +1 more
doaj   +1 more source

The basic propositions on defect numbers, root numbers and indices of linear operators [PDF]

, 2020
: In this work, we use the notion of the measure of noncompactness in order to establish some results concerning the class of semi-Fredholm and Fredholm operators.
Weidmann, ; J 47b07. ; K. Astala, E Daneš ; D, C Evans ; I, M G Gohberg, 47a55, ; K Goldberg, 47a10, K Banaś, 47a53, ; S Kreǐn, W D Edmunds, ; J Geobel, J Gustafson   +13 more
core  

Fredholm theory in ordered Banach algebras

, 2016
This paper illustrates some initial steps taken in the effort of unifying the theory of positivity in ordered Banach algebas (OBAs) with the general Fred-holm theory in Banach algebras.
Benjamin, Ronalda, Mouton, Sonja
core  

On Inverse Spectral Theory for Self-Adjoint Extensions: Mixed Types of Spectra

, 1998
LetHbe a symmetric operator in a separable Hilbert space H. Suppose thatHhas some gapJ. We shall investigate the question about what spectral properties the self-adjoint extensions ofHcan have inside the gapJand provide methods on how to construct self ...
Albeverio, Sergio, Neidhardt, Hagen, Brasche, Johannes   +2 more
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EIGENVALUE PROBLEM MEETS SIERPINSKI TRIANGLE: COMPUTING THE SPECTRUM OF A NON-SELF-ADJOINT RANDOM OPERATOR

, 2020
. The purpose of this paper is to prove that the spectrum of the non-self-adjoint oneparticle Hamiltonian proposed by J. Feinberg and A. Zee (Phys. Rev. E 59 (1999), 6433-6443) has interior points.

core  

Characterization and stability of essential pseudospectra by measure of polynomially inessential operators

  In this article, we investigate the essential pseudospectra through the framework of polynomially inessential operators, which extends the class of polynomially strictly singular operators and provides a broader setting for Fredholm-type ...
ELGABEUR, Bilel
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Random Schrödinger operators arising from lattice gauge fields II: determinants

, 1995
We introduce and study the variational problem to maximize the determinant of a random selfadjoint operators obtained from discrete abelian or nonabelian lattice gauge fields.
Oliver Knill
core  

Discrete random electromagnetic Laplacians

, 1995
We consider discrete random magnetic Laplacians in the plane and discrete random electromagnetic Laplacians in higher dimensions. The existence of these objects relies on a theorem of Feldman-Moore which was generalized by Lind to the nonabelian case ...
Oliver Knill
core