Results 11 to 20 of about 69,047 (280)
Numerical range and numerical radius for some operators
Linear Algebra and its Applications, 2010 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Karaev, M. T., Iskenderov, N. Sh.
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Sesquilinear version of numerical range and numerical radius
Acta Universitatis Sapientiae, Mathematica, 2017 AbstractIn this paper by using the notion of sesquilinear form we introduce a new class of numerical range and numerical radius in normed space 𝒱, also its various characterizations are given. We apply our results to get some inequalities.
Moradi, HR +3 more
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Schur product of matrices and numerical radius (range) preserving maps
Linear Algebra and its Applications, 2007 Let \(M_n\) (resp., \(H_n)\) be the algebra of \(n\)-by-\(n\) complex matrices (resp., Hermitian matrices). The numerical range \(W(A)\) and numerical radius \(w(A)\) of \(A\) in \(M_n\) are given by \[ W(A)=\{x^*Ax: x\in\mathbb{C}^n,x^*x=1\}\quad\text{and} \quad w(A)=\max\{|\lambda|: \lambda\in W(A)\}, \] respectively.
Li, Chi-Kwong, Poon, Edward
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On a Numerical Radius Preserving Onto Isometry on L(X) [PDF]
Journal of Function Spaces, 2016 We study a numerical radius preserving onto isometry on L(X). As a main result, when X is a complex Banach space having both uniform smoothness and uniform convexity, we show that an onto isometry T on L(X) is numerical radius preserving if and only if ...
Sun Kwang Kim
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Numerical radius inequalities for Hilbert $C^{*}$-modules [PDF]
, 2022 summary:We present a new method for studying the numerical radius of bounded operators on Hilbert $C^*$-modules. Our method enables us to obtain some new results and generalize some known theorems for bounded operators on Hilbert spaces to bounded ...
Fakri Moghaddam, Sadaf +1 more
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Numerical Simulation of Supersonic Carman Curve Bodies with Aerospike
International Journal of Aerospace Engineering, 2021 Drag reduction is one of the important problems for the supersonic vehicles. As one of the drag reduction methods, aerospike has been used in some equipment because of its good drag reduction effect.
HaiLong Zhao +5 more
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Applied Sciences, 2022 Compared with straight tunnels, over-excavation occurs on the inner side of the curved section during shield construction of small radius curved tunnels, and the disturbance to the ground surface and mechanical properties of surrounding rock and segment ...
Ping Lou +4 more
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Gong-kuang zidonghua, 2020 Current research on hydraulic punching technology seldom considers that pressure relief range of hydraulic punching in inclined coal seam varies with direction and influence of coal seam inclination on the effective radius of hydraulic punching pressure ...
HUA Mingguo, YAO Banghua, LI Jianwei
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Norm and Numerical Radius Inequalities for a Product of Two Linear Operators in Hilbert Spaces [PDF]
, 2006 The main aim of the present paper is to establish some norm and numerical radius inequalities for the composite operator BA under suitable assumptions for the transform Cα ,β (T) := (T∗ −α I)(β I−T) , where α ,β ∈ C and T ∈ B(H), of the operators ...
S. S. Dragomir +2 more
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Non-linear maps on self-adjoint operators preserving numerical radius and numerical range of Lie product [PDF]
Linear and Multilinear Algebra, 2015 22 ...
He, Kan, Hou, Jinchuan
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