Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Nahum Krupnik"'
Autor:
Nahum Krupnik
Publikováno v:
Operators and Matrices. :1175-1180
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b8ffc86c68cc088be7d83d2c65c510e8
https://doi.org/10.7153/oam-08-67
https://doi.org/10.7153/oam-08-67
Autor:
Nahum Krupnik, Alexander Markus
Publikováno v:
Large Truncated Toeplitz Matrices, Toeplitz Operators, and Related Topics ISBN: 9783319491806
Let \( \mathcal{B} \) be a Banach space and let \( P,Q \,(P,Q\, \neq 0) \) be two complementary projections in \( \mathcal{B} \, ({\rm i.e.,}\, P \,+\,Q\,=\,I) \). For dim \( \mathcal{B} > 2 \) we show that formulas of the kind \( \parallel {aP \, +\
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0e7940823cd530d35dd883a9948e85b1
https://doi.org/10.1007/978-3-319-49182-0_20
https://doi.org/10.1007/978-3-319-49182-0_20
Publikováno v:
Integral Equations and Operator Theory. 49:149-164
In this paper a new algorithm is proposed for explicit factorization of 2 x 2 matrix functions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b36b3f53990ffb2427f6301f0df6c73
https://doi.org/10.1007/s00020-003-1277-1
https://doi.org/10.1007/s00020-003-1277-1
The authors initially planned to write an article describing the origins and devel opments of the theory of Fredholm operators and to present their recollections of this topic. We started to read again classical papers and we were sidetracked by th
Autor:
Nahum Krupnik, Israel Feldman
Publikováno v:
A Panorama of Modern Operator Theory and Related Topics ISBN: 9783034802208
Some new classes of algebras in which each Fredholm operator is invertible are described. Mathematics Subject Classification (2000). Primary 47A53, Secondary 45E10.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad6a92cbae3b9b2011d58f1ad466a62e
https://doi.org/10.1007/978-3-0348-0221-5_14
https://doi.org/10.1007/978-3-0348-0221-5_14
Autor:
Israel Gohberg, Nahum Krupnik
Publikováno v:
Convolution Equations and Singular Integral Operators ISBN: 9783764389550
Let Г be a closed or open oriented Lyapunov arc and ω(t) be a bijective mapping of Г onto itself. An operator of the form \( A = a(t)I + b(t)S + (c(t) + d(t)S)W \) is usually called a one-dimensional singular integral operator with shift ω(t). He
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0faf92c117c6a2ffe62762cddb7d6556
https://doi.org/10.1007/978-3-7643-8956-7_13
https://doi.org/10.1007/978-3-7643-8956-7_13
Autor:
Israel Gohberg, Nahum Krupnik
Publikováno v:
Convolution Equations and Singular Integral Operators ISBN: 9783764389550
The main topic of the present paper is the study of some Banach algebras of bounded linear operators acting in the spaces l p (1 < p < ∞). Generators of these algebras are defined by Toeplitz matrices constructed from the Fourier coefficients of fu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d0eea923934fd233f5b2496c770f1161
https://doi.org/10.1007/978-3-7643-8956-7_11
https://doi.org/10.1007/978-3-7643-8956-7_11
Autor:
Nahum Krupnik, Israel Gohberg
Publikováno v:
Convolution Equations and Singular Integral Operators ISBN: 9783764389550
In this paper the algebra generated by singular integral operators A of the form \( (A\phi )(t) = a(t)\phi (t) + \frac{{b(t)}} {{\pi i}}\int_\Gamma {\frac{{\phi (t)}} {{\tau - t}}d\tau } \left( {t \in \Gamma } \right), \) where Γ is an oriented cont
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5081fa0d2ebea5296d3dd1dd7aa4b77
https://doi.org/10.1007/978-3-7643-8956-7_10
https://doi.org/10.1007/978-3-7643-8956-7_10
Autor:
Nahum Krupnik, Israel Gohberg
Publikováno v:
Convolution Equations and Singular Integral Operators ISBN: 9783764389550
Let Г be a contour in the complex plane that consists of n simple closed curves Г1, ..., Гn having one common point t0. We orient the contour Г by choosing the counter-clockwise orientation on each curve Гj. Everywhere in what follows we will su
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::988b0d74226a192752f587f0f251c3c2
https://doi.org/10.1007/978-3-7643-8956-7_12
https://doi.org/10.1007/978-3-7643-8956-7_12
Autor:
Nahum Krupnik, Israel Gohberg
Publikováno v:
Convolution Equations and Singular Integral Operators ISBN: 9783764389550
In this note the results of [1] are generalized to the case of an arbitrary simple closed Lyapunov contour and an arbitrary Carleman shift changing the orientation of the contour.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2057c017883ee0537cf4f5bbef49ed31
https://doi.org/10.1007/978-3-7643-8956-7_14
https://doi.org/10.1007/978-3-7643-8956-7_14