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In the mathematical field of linear algebra and convex analysis, the numerical range or field of values of a complex matrix A is the set where denotes the conjugate transpose of the vector . The numerical range includes, in particular, the diagonal entries of the matrix (obtained by choosing x equal to the unit vectors along the coordinate axes) and the eigenvalues of the matrix (obtained by choosing x equal to the eigenvectors). A related concept is the numerical radius, which is the largest absolute value of the numbers in the numerical range, i.e.

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  • Der numerische Wertebereich (englisch: numerical range) ist ein Begriff aus dem mathematischen Teilgebiet der Funktionalanalysis. Einem stetigen linearen Operator oder allgemeiner einem Element einer Banachalgebra wird eine Menge des Grundkörpers zugeordnet. Diese Menge verbindet algebraische Informationen mit Eigenschaften der Norm. (de)
  • In the mathematical field of linear algebra and convex analysis, the numerical range or field of values of a complex matrix A is the set where denotes the conjugate transpose of the vector . The numerical range includes, in particular, the diagonal entries of the matrix (obtained by choosing x equal to the unit vectors along the coordinate axes) and the eigenvalues of the matrix (obtained by choosing x equal to the eigenvectors). In engineering, numerical ranges are used as a rough estimate of eigenvalues of A. Recently, generalizations of the numerical range are used to study quantum computing. A related concept is the numerical radius, which is the largest absolute value of the numbers in the numerical range, i.e. (en)
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  • Der numerische Wertebereich (englisch: numerical range) ist ein Begriff aus dem mathematischen Teilgebiet der Funktionalanalysis. Einem stetigen linearen Operator oder allgemeiner einem Element einer Banachalgebra wird eine Menge des Grundkörpers zugeordnet. Diese Menge verbindet algebraische Informationen mit Eigenschaften der Norm. (de)
  • In the mathematical field of linear algebra and convex analysis, the numerical range or field of values of a complex matrix A is the set where denotes the conjugate transpose of the vector . The numerical range includes, in particular, the diagonal entries of the matrix (obtained by choosing x equal to the unit vectors along the coordinate axes) and the eigenvalues of the matrix (obtained by choosing x equal to the eigenvectors). A related concept is the numerical radius, which is the largest absolute value of the numbers in the numerical range, i.e. (en)
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  • Numerischer Wertebereich (de)
  • Numerical range (en)
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