Results 71 to 80 of about 332 (118)

Spectra and fine Spectra of the upper triangular band matrix U(a;0;b) over the sequence space c0

Miskolc Mathematical Notes, 2019
The aim of this paper is to obtain the spectrum, fine spectrum, approximate point spectrum, defect spectrum and compression spectrum of the operator U.aI0Ib/D 266666664 a0 0 b0 0 0 0 0 0 0 0 a1 0 b1 0 0 0 0 0 0 0 a2 0 b2 0 0 0 0 0 0 0 a0 0 b0 0 0 0 0 0 0
N. Durna
semanticscholar   +1 more source

Semigroup estimates and fast-slow dynamics in parabolic-hyperbolic systems

Advances in Nonlinear Analysis, 2018
We present a general procedure to describe slow dynamics in parabolic-hyperbolic systems, under suitable assumptions on the terms appearing in the equations. In particular, our strategy relies in semigroup estimates for the evolution system associated to
Strani Marta
doaj   +1 more source

A note on preservers of pseudo spectrum of matrix products

Operators and Matrices, 2019
Let M2 be the algebra of 2×2 complex matrices. For ε > 0 , complete descriptions are given of the maps of M2 leaving invariant the ε -pseudo spectrum of A ∗B , where A ∗B stands either for the Jordan semi-triple product ABA or the skew product AB∗ on ...
M. Bendaoud, A. Benyouness, M. Sarih
semanticscholar   +1 more source

Study of weighted elliptic composition operators on the unit ball of ℂN

Concrete Operators
We study the general properties, point spectrum and spectrum of a weighted composition operator Wm,φ{W}_{m,\varphi } with elliptic symbol φ\varphi on the unit ball BN{{\mathbb{B}}}_{N} of CN{{\mathbb{C}}}^{N}, and general weight m∈Hol(BN)m\in {\rm{Hol}}\
Oger Lucas
doaj   +1 more source

Maps preserving the peripheral local spectrum of some product of operators

Operators and Matrices, 2019
Let H and K be two infinite-dimensional complex Hilbert spaces. Let B(H ) denote the algebra of all bounded linear operators on H . If T is an operator in B(H ) and x a vector in H then γT (x) denotes the peripheral local spectrum of T at x .
A. E. Ghazi, Rabi Marzouki
semanticscholar   +1 more source

The invertibility for linear combinations of bounded linear operators with closed range

, 2017
In this paper, it is given that the sufficient and necessary conditions for the invertibility of linear combinations of bounded linear operators with closed range. Furthermore, some related results are obtained. Mathematics subject classification (2010):
Guojun Hai, C. Bao, Alatancang Chen
semanticscholar   +1 more source

Study of the asymptotic eigenvalue distribution and trace formula of a second order operator-differential equation

Boundary Value Problems, 2011
The purpose of writing this article is to show some spectral properties of the Bessel operator equation, with spectral parameter-dependent boundary condition.
Aslanova Nigar
doaj  

Spectrum of the quadratic eigenparameter dependent discrete Dirac equations

, 2014
Let us consider the Boundary Value Problem (BVP) for the discrete Dirac equations an+1yn+1(2)+bnyn(2)+pnyn(1)=λyn(1), an−1yn−1(1)+bnyn(1)+qnyn(2)=λyn(2), n∈N, (γ0+γ1λ+γ2λ2)y1(2)+(β0+β1λ+β2λ2)y0(1)=0, where (an), (bn), (pn) and (qn), n∈N are complex ...
T. Koprubasi
semanticscholar   +1 more source

Expansion of eigenvalues of the perturbed discrete bilaplacian. [PDF]

Mon Hefte Math, 2022
Kholmatov SY, Khalkhuzhaev A, Pardabaev M.   +2 more
europepmc   +1 more source

Well-posedness and stability analysis of an epidemic model with infection age and spatial diffusion. [PDF]

J Math Biol, 2023
Walker C.
europepmc   +1 more source