Results 81 to 90 of about 142 (138)
A Lower Bound for the Differences of Powers of Linear Operators
, 2008 Let T be a bounded linear operator in a Banach space, with σ(T) = {1}. In 1983, Esterle–Berkani ’ s conjecture was proposed for the decay of differences (I − T) T n as follows: Either lim infn→ ∞ (n + 1) (I − T) T n ≥ 1/e or T = I.
V. Turunen +3 more
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Static spectra and static families of Fredholm-type operators under tensor product
Arab Journal of Basic and Applied SciencesIn 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
Optimal vaccination: various (counter) intuitive examples. [PDF]
J Math Biol, 2023 Delmas JF, Dronnier D, Zitt PA.
europepmc +1 more source
Spectral points of type π+ and type π- of closed operators in indefinite inner product spaces [PDF]
, 2014 We introduce the notion of spectral points of type π+ and type π− of closed operators A in a Hilbert space which is equipped with an indefinite inner product. It is shown that these points are stable under compact perturbations.
Trunk, Carsten, Philipp, Friedrich
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Existence and stability of solution for time-delayed nonlinear fractional differential equations
Applied Mathematics in Science and EngineeringThe 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 +1 more
doaj +1 more source
, 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.
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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 +13 more
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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
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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
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Pseudospectra of the Wave Operator with an Absorbing Boundary
, 1993 For systems which can be described by u t = Au, with a highly non-normal matrix or operator A, the spectrum of A may describe the behavior of the system poorly.
Lloyd N. Trefethen +3 more
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