Subject
Discrete Mathematics and Combinatorics,Geometry and Topology,Numerical Analysis,Algebra and Number Theory
Reference4 articles.
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2. Karl E. Gustafson and Duggirala K. M. Rao, Numerical range. The field of values of linear operators and matrices, Universitext, Springer-Verlag, New York, 1997.
3. Samah Abu Sammour, Fuad Kittaneh and Mohammad Sababheh, A Geometric Approach to Numerical Radius Inequalities, Linear Algebra and its Applications 652(2022)1–17.
4. P. Y. Wu and H.-L. Gau, Numerical Ranges of Hilbert Space Operators, Encyclopedia of Mathematics and its Applications v179, Cambridge University Press 2021.