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Numerical range and numerical radius (An introduction)
Numerical range and numerical radius as an important instrument for the description of linear operators are analysed in this paper. The possibilities of the computations of the numerical range and nume...
BI - Akustika a kmity
- 2004 •
- D
Rok uplatnění
D - Stať ve sborníku
Numerical ranges of antilinear operators
We study numerical ranges of antilinear operators on both Hilbert and Banach spaces. We prove that the numerical range of an antilinear operator on at least two-dimensional space is always a disc, and so a convex s...
Pure mathematics
- 2024 •
- Jimp •
- Link
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Jimp - Článek v periodiku v databázi Web of Science
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The joint essential numerical range, compact perturbations, and the Olsen problem
Let T be an n-tuple of bounded linear operators on a complex Hilbert space H. Then there exists an n-tuple K of compact operators such that the essential numerical range of T equals to the closure of the numerical range...
BA - Obecná matematika
- 2010 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
On the essential numerical range
We introduce and study the essential numerical range for Banach space operators. This generalizes the corresponding well-known concept for Hilbert space operators....
BA - Obecná matematika
- 2005 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Numerical simulation of compressible flow with a wide range of the Mach number by the discontinuous Galerkin method
Numerical simulation of compressible flow with a wide range of the Mach number by the discontinuous Galerkin method...
BK - Mechanika tekutin
- 2005 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Joint numerical ranges: Recent advances and applications minicourse by V. Müller and Yu. Tomilov
We present a survey of some recent results concerning joint numerical ranges of n-tuples of Hilbert space operators, accompanied with several new observations and remarks. Thereafter, numerical ranges techniques wi...
Pure mathematics
- 2020 •
- Jimp •
- Link
Rok uplatnění
Jimp - Článek v periodiku v databázi Web of Science
Výsledek na webu
Semidefinite Geometry of the Numerical Range
The numerical range of a matrix is studied geometrically via the cone of positive semidefinite matrices (or semidefinite cone for short). In particular), an affine section of the semidefinite cone, is always dual to the numerica...
BA - Obecná matematika
- 2010 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Circles in the spectrum and the geometry of orbits: a numerical ranges approach
is obtained via the study of numerical ranges of operator tuples where several new results are also obtained. As consequences of our numerical ranges approach, we derive......
Pure mathematics
- 2018 •
- Jimp •
- Link
Rok uplatnění
Jimp - Článek v periodiku v databázi Web of Science
Výsledek na webu
Far-Field Antenna Range
of antenna range optimizing by using numerical simulation considering various constraintsMeasurements of test antennas are performed on antenna ranges. The operated microwave far-field outdoor range was built-up i...
JA - Elektronika a optoelektronika, elektrotechnika
- 2015 •
- D •
- Link
Rok uplatnění
D - Stať ve sborníku
Výsledek na webu
Optimization of Far-Field Antenna Range
of antenna range optimizing by using numerical simulation considering various constrainsMeasurements of test antennas are performed on antenna ranges. The operated microwave far-field outdoor range was built-up in...
JA - Elektronika a optoelektronika, elektrotechnika
- 2015 •
- Jx •
- Link
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Výsledek na webu
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