Boundary points of joint numerical ranges

DOI10.2140/pjm.1981.95.27zbMath0502.47002OpenAlexW2072711306MaRDI QIDQ1172798

Makoto Takaguchi, Muneo Chō

Publication date: 1981

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

Full work available at URL: https://doi.org/10.2140/pjm.1981.95.27

zbMATH Keywords

joint numerical rangejoint approximate point spectrumconical pointjoint eigenvalue

Mathematics Subject Classification ID

Numerical range, numerical radius (47A12)

Related Items (20)

Joint numerical ranges for unbounded normal operators ⋮ Joint k-numerical ranges of operators ⋮ Joint numerical ranges of operators in semi-Hilbertian spaces ⋮ On the joint numerical spectrum in Banach spaces ⋮ A note on doubly commuting tuples of hyponormal operators on Hilbert spaces ⋮ Commuting tuples of normal operators in Hilbert spaces ⋮ Inequalities involving the generalized spherical Aluthge transform of operators ⋮ Variational Characterization of Monotone Nonlinear Eigenvector Problems and Geometry of Self-Consistent Field Iteration ⋮ Ergodicity of commuting multioperators and holomorphic multioperators of multiplication ⋮ On some inequalities for numerical radius of semi-Hilbert space multioperators ⋮ On tuples of commuting operators in positive semidefinite inner product spaces ⋮ Upper bounds for the Euclidean spectral radius of operators via joint norms ⋮ Unnamed Item ⋮ A note on the boundary of the joint numerical range ⋮ In search of convexity: diagonals and numerical ranges ⋮ On joint spectral radius of commuting operators in Hilbert spaces ⋮ Polynomial numerical hulls of matrix polynomials, II ⋮ Joint normality of operators in semi-Hilbertian spaces ⋮ Joint numerical radius of spherical Aluthge transforms of tuples of Hilbert space operators ⋮ A geometric spectral theory for \(n\)-tuples of self-adjoint operators in finite von Neumann algebras

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