In this paper the notion of quadratic numerical range for the operator matrices of order 2 is studied and its main properties are given. Formulas for the quadratic numerical range of the generalized Friedrichs model are described. The estimates for the boundaries of the components of the quadratic numerical range allowed us to determine the location of the eigenvalues of the generalized Friedrichs model
Abstract. It is shown that the result of Tso-Wu on the elliptical shape of the numerical range of qu...
Let p, q, n be integers satisfying 1 ≤ p ≤ q ≤ n. The (p, q)-numerical range of an n×n complex matri...
This is an English translation of the paper "Über den Wertevorrat einer Matrix" by Rudolf Kippenhahn...
AbstractIn this paper a new concept for 2×2-block operator matrices – the quadratic numerical range ...
In this thesis, we discuss important results for the numerical range of general square matrices. Esp...
In this thesis, we discuss important results for the numerical range of general square matrices. Esp...
In this thesis, we discuss important results for the numerical range of general square matrices. Esp...
AbstractA new generalization of the classical numerical range of a matrix is introduced. Various pro...
We consider a $2\times2$ operator matrix $A$ (so-called generalized Friedrichs model) associated wit...
We study the relationship between operators and their numerical ranges. The main results are as foll...
We study the relationship between operators and their numerical ranges. The main results are as foll...
We study the relationship between operators and their numerical ranges. The main results are as foll...
ABSTRACT. A bounded linear operator acting on a Hilbert space is a generalized qua-dratic operator i...
Abstract. This is an introduction to the notion of numerical range for bounded linear operators on H...
For a bounded linear operator A (or, in the finite dimensional setting, an n-by-n matrix A) its clas...
Abstract. It is shown that the result of Tso-Wu on the elliptical shape of the numerical range of qu...
Let p, q, n be integers satisfying 1 ≤ p ≤ q ≤ n. The (p, q)-numerical range of an n×n complex matri...
This is an English translation of the paper "Über den Wertevorrat einer Matrix" by Rudolf Kippenhahn...
AbstractIn this paper a new concept for 2×2-block operator matrices – the quadratic numerical range ...
In this thesis, we discuss important results for the numerical range of general square matrices. Esp...
In this thesis, we discuss important results for the numerical range of general square matrices. Esp...
In this thesis, we discuss important results for the numerical range of general square matrices. Esp...
AbstractA new generalization of the classical numerical range of a matrix is introduced. Various pro...
We consider a $2\times2$ operator matrix $A$ (so-called generalized Friedrichs model) associated wit...
We study the relationship between operators and their numerical ranges. The main results are as foll...
We study the relationship between operators and their numerical ranges. The main results are as foll...
We study the relationship between operators and their numerical ranges. The main results are as foll...
ABSTRACT. A bounded linear operator acting on a Hilbert space is a generalized qua-dratic operator i...
Abstract. This is an introduction to the notion of numerical range for bounded linear operators on H...
For a bounded linear operator A (or, in the finite dimensional setting, an n-by-n matrix A) its clas...
Abstract. It is shown that the result of Tso-Wu on the elliptical shape of the numerical range of qu...
Let p, q, n be integers satisfying 1 ≤ p ≤ q ≤ n. The (p, q)-numerical range of an n×n complex matri...
This is an English translation of the paper "Über den Wertevorrat einer Matrix" by Rudolf Kippenhahn...
DOI
Add to ORKG