Results 1 to 10 of about 1,463 (129)
Preservers of condition spectra and pseudo spectra of Hermitian matrix Jordan products
Operators and Matrices, 2023 . Let H n be the real space of n × n complex Hermitian matrices. Complete descriptions are given of the maps of H n leaving invariant the pseudo spectral radius or the condition spectral radius of Jordan product of matrices.
M. Bendaoud, A. Benyouness, A. Cade
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Characterizations of Hopfians spaces
Operators and Matrices, 2023 . A Banach space X is called Hop fi an, if any bounded linear operator surjective is bijective. The existence of the Banach Hop fi ans spaces in in fi nite dimension was established by Gowers and Maury in 1993.
H. Boua, A. Tajmouati
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M-hypercyclicity of C0-semigroup and Svep of its generator
Concrete Operators, 2021 Let 𝒯 = (Tt)t≥0 be a C0-semigroup on a separable infinite dimensional Banach space X, with generator A. In this paper, we study the relationship between the single valued extension property of generator A, and the M-hypercyclicity of the C0-semigroup ...
Toukmati A.
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Limit points for descent spectrum of operator matrices
Moroccan Journal of Pure and Applied Analysis, 2022 In this paper, we investigate the limit points set of descent spectrum of upper triangular operator matrices MC=(AC0B){M_C} = \left( {\matrix{A \hfill & C \hfill \cr 0 \hfill & B \hfill \cr } } \right).
Boua H., Karmouni M., Tajmouati A.
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Open Mathematics, 2023 In this article, we focus on the scattering analysis of Sturm-Liouville type singular operator including an impulsive condition and turning point. In the classical literature, there are plenty of papers considering the positive values of the weight ...
Çoşkun Nimet, Görgülü Merve
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On the compactness and spectra of the generalized difference operator on the spaces ℓ^∞ and bv
Operators and Matrices, 2021 In this paper, we consider the compactness and the spectrum of the generalized difference operator Δab on the Banach sequence spaces ∞ , of bounded sequences, and bv , of bounded variation sequences, which allows us to generalize and extend some existing
S. El-Shabrawy, Y. Sawano
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Jacobson’s Lemma in the ring of quaternionic linear operators
Moroccan Journal of Pure and Applied Analysis, 2021 In the present paper, we study the Jacobson’s Lemma in the unital ring of all bounded right linear operators ℬR(X) acting on a two-sided quaternionic Banach space X. In particular, let A, B ∈ ℬR(X) and let q ∈ ℍ \ {0}, we prove that w(AB) \ {0} = w(BA) \
Benabdi El Hassan, Barraa Mohamed
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Closedness of ranges of unbounded upper triangular operator matrices
Operators and Matrices, 2021 This paper deals with the closed range property of operator matrices. The necessary and sufficient condition is given for an unbounded upper triangular partial operator matrix to have a closed range completion.
Y. Qi, J. Huang, Alatancang Chen
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Spectrum and Analytic Functional Calculus for Clifford Operators via Stem Functions
Concrete Operators, 2021 The main purpose of this work is the construction of an analytic functional calculus for Clifford operators, which are operators acting on certain modules over Clifford algebras.
Vasilescu Florian-Horia
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Properties of J-self-adjoint operators
Operators and Matrices, 2021 In this paper, we consider operators T ∈ L (H ) such that (JT )∗ = JT for some anti-unitary J with J2 = −I ; in this case, we say that T is J -self-adjoint. We show that the Aluthge transform of a J -self-adjoint operator is skew-complex symmetric. As an
Sungeun Jung
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