Circularity of the numerical range
Copyright policy )Circularity of the numerical range
The authors give an equivalent condition on a 3 or 4-square real upper triangular matrix for its numerical range to be a circular disk centered at the origin. Some sufficient condition on certain sparse matrices for the same problem are also obtained.
- Tamkang University Taiwan
- Soochow University Taiwan
Numerical Analysis, Algebra and Number Theory, triangular matrix, circular disk, sparse matrices, Norms of matrices, numerical range, applications of functional analysis to matrix theory, Discrete Mathematics and Combinatorics, numerical range, Geometry and Topology
Numerical Analysis, Algebra and Number Theory, triangular matrix, circular disk, sparse matrices, Norms of matrices, numerical range, applications of functional analysis to matrix theory, Discrete Mathematics and Combinatorics, numerical range, Geometry and Topology
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