Elliptic numerical ranges of \(4\times 4\) matrices

DOI10.11650/twjm/1500403803zbMath1099.15022OpenAlexW2738268764MaRDI QIDQ2493614

Hwa-Long Gau

Publication date: 26 June 2006

Published in: Taiwanese Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.11650/twjm/1500403803

zbMATH Keywords

eigenvaluenumerical rangeKippenhahn curve

Mathematics Subject Classification ID

Eigenvalues, singular values, and eigenvectors (15A18) Norms of matrices, numerical range, applications of functional analysis to matrix theory (15A60)

Related Items (10)

Исследование числовой области значений одной операторной матрицы ⋮ Poncelet-Darboux, Kippenhahn, and Szegő: interactions between projective geometry, matrices and orthogonal polynomials ⋮ Elliptic modular invariants of 4-by-4 matrices ⋮ Elliptic numerical ranges of \(3 \times 3\) companion matrices ⋮ When is the numerical range of a nilpotent matrix circular? ⋮ Numerical ranges of row stochastic matrices ⋮ Properties and preservers of numerical radius on skew Lie products of operators ⋮ On foci of ellipses inscribed in cyclic polygons ⋮ Norms of truncated Toeplitz operators and numerical radii of restricted shifts ⋮ On some 4-by-4 matrices with bi-elliptical numerical ranges

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