Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Marko Lindner"'
Autor:
Marko Lindner, Dennis Schmeckpeper
Publikováno v:
Opuscula Mathematica, Vol 43, Iss 1, Pp 101-108 (2022)
For a bounded linear operator on a Banach space, we study approximation of the spectrum and pseudospectra in the Hausdorff distance. We give sufficient and necessary conditions in terms of pointwise convergence of appropriate spectral quantities.
Externí odkaz:
https://doaj.org/article/7676bb0b4efd4c8c8ccf3c17b7d8727f
Autor:
Marko Lindner
Publikováno v:
Opuscula Mathematica, Vol 38, Iss 6, Pp 849-857 (2018)
In their recent paper "The spectral norm of a Horadam circulant matrix", Merikoski, Haukkanen, Mattila and Tossavainen study under which conditions the spectral norm of a general real circulant matrix \({\bf C}\) equals the modulus of its row/column
Externí odkaz:
https://doaj.org/article/8d54a1ee6656441694826f54c0efb07d
Autor:
Marko Lindner, Dennis Schmeckpeper
Publikováno v:
Opuscula mathematica 43 (1): 101–108 (2023)
For a bounded linear operator on a Banach space, we study approximation of the spectrum and pseudospectra in the Hausdorff distance. We give sufficient and necessary conditions in terms of pointwise convergence of appropriate spectral quantities.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28cceea8fa22a15062f028c428f95e4f
https://doi.org/10.7494/opmath.2023.43.1.101
https://doi.org/10.7494/opmath.2023.43.1.101
Autor:
Marko Lindner, Riko Ukena
We study 1D discrete Schr\"odinger operators $H$ with integer-valued potential and show that, $(i)$, invertibility (in fact, even just Fredholmness) of $H$ always implies invertibility of its half-line compression $H_+$ (zero Dirichlet boundary condi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a51eb350aea86805a24bc1030f2e0e5e
http://arxiv.org/abs/2208.04015
http://arxiv.org/abs/2208.04015
Autor:
Marko Lindner
We study two abstract scenarios, where an operator family has a certain minimality property. In both scenarios, it is shown that norm, spectrum and resolvent are the same for all family members. Both abstract settings are illustrated by practically r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0de9f2a798ba474681213d831b1f154e
http://arxiv.org/abs/2111.13750
http://arxiv.org/abs/2111.13750
Publikováno v:
IEEE Journal on Multiscale and Multiphysics Computational Techniques. 4:88-97
This paper presents a multiscale method for the numerically efficient electromagnetic analysis of two-dimensional (2-D) photonic and electromagnetic crystals. It is based on a contour integral method and a segmented analysis of more complex structure
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e0b2338e3d16a353d8662a920542735
https://doi.org/10.1109/jmmct.2019.2904195
https://doi.org/10.1109/jmmct.2019.2904195
Autor:
Marko Lindner, Christian Schuster, Heinz-Dietrich Bruns, Lei Wang, Eduard Frick, Christian Seifert, David Dahl
Publikováno v:
IEEE Journal on Multiscale and Multiphysics Computational Techniques. 4:180-189
This paper presents a hybrid boundary element method for the efficient simulation of substrate-integrated waveguide (SIW) horn antennas. It is applicable with good accuracy to relatively thin structures with conventional circular ground vias. In the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::58758e77f679439fb254cc2702cb28e8
https://doi.org/10.1109/jmmct.2019.2931936
https://doi.org/10.1109/jmmct.2019.2931936
Publikováno v:
Proceedings of the Edinburgh Mathematical Society. 61:371-386
We consider equivariant continuous families of discrete one-dimensional operators over arbitrary dynamical systems. We introduce the concept of a pseudo-ergodic element of a dynamical system. We then show that all operators associated to pseudo-ergod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::608fde13ca266b88844af92b78c3c6f9
https://doi.org/10.1017/s0013091517000086
https://doi.org/10.1017/s0013091517000086
Publikováno v:
Mathematische Zeitschrift. 287:993-1007
It is well known that, given an equivariant and continuous (in a suitable sense) family of selfadjoint operators in a Hilbert space over a minimal dynamical system, the spectrum of all operators from that family coincides. As shown recently similar r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::34283d579cebb0c1080ed4f334271482
https://doi.org/10.1007/s00209-017-1856-5
https://doi.org/10.1007/s00209-017-1856-5
Autor:
Torge Schmidt, Marko Lindner
Publikováno v:
Operators and Matrices. :1171-1196
We study spectra and pseudospectra of certain bounded linear operators on $\ell^2({\mathbb Z})$. The operators are generally non-normal, and their matrix representation has a characteristic off-diagonal decay. Based on a result of Chandler-Wilde, Cho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f91ef6de02ed0af404d604028f043fc5
https://doi.org/10.7153/oam-2017-11-80
https://doi.org/10.7153/oam-2017-11-80