Results 21 to 30 of about 332 (118)
(A,m)-Symmetric commuting tuples of operators on a Hilbert space
Mathematical Inequalities & Applications, 2019 Let T = (T1, · · · ,Td) and A be a commuting d -tuple of operators and a positive operator on a complex Hilbert space, respectively. We introduce an (A,m) -symmetric commuting tuple of operators and characterize the joint approximate point spectrum of (A,
M. Chō, S. Mahmoud
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International Journal of Mathematics and Mathematical Sciences, Volume 2004, Issue 27, Page 1437-1445, 2004., 2004 We investigate the spectrum of the differential operator Lλ defined by the Klein‐Gordon s‐wave equation y″ + (λ − q(x)) 2y = 0, x ∈ ℝ+ = [0, ∞), subject to the spectral parameter‐dependent boundary condition y′(0) − (aλ + b)y(0) = 0 in the space L2(ℝ+), where a ≠ ±i, b are complex constants, q is a complex‐valued function.
Gülen Başcanbaz-Tunca
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On new strong versions of Browder type theorems
Open Mathematics, 2018 An operator T acting on a Banach space X satisfies the property (UWΠ) if σa(T)∖ σSF+−$\begin{array}{} \sigma_{SF_{+}^{-}} \end{array} $(T) = Π(T), where σa(T) is the approximate point spectrum of T, σSF+−$\begin{array}{} \sigma_{SF_{+}^{-}} \end{array} $
Sanabria José +4 more
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B-Fredholm elements in primitive C*-algebras
Open Mathematics, 2022 Let A{\mathcal{A}} be a unital primitive C∗\ast -algebra. This article studies the properties of the B-Fredholm elements, the B-Weyl elements and the B-Browder elements in A{\mathcal{A}}. Particularly, this article describes the B-Fredholm element as the
Kong Yingying, Jiang Lining
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On some properties of Banach operators. II
International Journal of Mathematics and Mathematical Sciences, Volume 2004, Issue 47, Page 2513-2515, 2004., 2004 Using the notion of a Banach operator, wehave obtained a decompositional property of aHilbert space, and the equality of two invertible boundedlinear multiplicative operators on a normed algebra with identity.
A. B. Thaheem, A. R. Khan
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Spectrum perturbations of compact operators in a Banach space
Open Mathematics, 2019 For an integer p ≥ 1, let Γp be an approximative quasi-normed ideal of compact operators in a Banach space with a quasi-norm NΓp(.) and the ...
Gil’ Michael
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Structure of n-quasi left m-invertible and related classes of operators
Demonstratio Mathematica, 2020 Given Hilbert space operators T,S∈B(ℋ)T,S\in B( {\mathcal H} ), let Δ\text{Δ} and δ∈B(B(ℋ))\delta \in B(B( {\mathcal H} )) denote the elementary operators ΔT,S(X)=(LTRS−I)(X)=TXS−X{\text{Δ}}_{T,S}(X)=({L}_{T}{R}_{S}-I)(X)=TXS-X and δT,S(X)=(
Duggal Bhagwati Prashad, Kim In Hyun
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A formula for the inner spectral radius
International Journal of Mathematics and Mathematical Sciences, Volume 2004, Issue 61, Page 3285-3290, 2004., 2004 This note presents an asymptotic formula for the minimum of the moduli of the elements in the spectrum of a bounded linear operator acting on Banach space X. This minimum moduli is called the inner spectral radius, and the formula established herein is an analogue of Gelfand′s spectral radius formula.
S. Mahmoud Manjegani
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Functional analysis method for the M/G/1 queueing model with single working vacation
Open Mathematics, 2018 In this paper, we study the asymptotic property of underlying operator corresponding to the M/G/1 queueing model with single working vacation, where both service times in a regular busy period and in a working vacation period are function. We obtain that
Kasim Ehmet, Gupur Geni
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The Spectrum and fine spectrum of generalized Rhaly-Cesàro matrices on c_0 and c
, 2018 The generalized Rhaly Cesàro matrices Aα are the triangular matrix with nonzero entries ank = αn−k/(n+1) with α ∈ [0,1] . In [Proc. Amer. Math. Soc. 86 (1982), 405409], Rhaly determined boundedness, compactness of generalized Rhaly Cesàro matrices on 2 ...
M. Yıldırım +2 more
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