Zobrazeno 1 - 10
of 68
pro vyhledávání: '"Frank-Olme Speck"'
Autor:
Frank-Olme Speck
Publikováno v:
Volume: 2, Issue: 4 183-216
Constructive Mathematical Analysis
Constructive Mathematical Analysis
This article presents a brief survey devoted to the interplay between diffraction and operator theory, particularly between the so-called canonical diffraction problems (exemplified by Sommerfeld half-plane problems) on one hand and operator factoris
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ceaa5179aecc4e34fd48c2fc49a8a2f1
https://doi.org/10.33205/cma.620578
https://doi.org/10.33205/cma.620578
Publikováno v:
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
J. Integral Equations Applications 32, no. 3 (2020), 275-292
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
J. Integral Equations Applications 32, no. 3 (2020), 275-292
This work is devoted to the analysis of the mixed impedance-Neumann-Dirichlet boundary value problem (MIND~BVP) for the Laplace-Beltrami equation on a compact smooth surface $\mathcal{C}$ with smooth boundary. We prove, using the Lax-Milgram Lemma, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::050f70db6ce0f3b406e07b019c6b64ce
Autor:
Frank-Olme Speck
Publikováno v:
Operator Theory, Analysis and the State Space Approach ISBN: 9783030042684
The aim of this work is to present criteria for the equivalent reduction of general Wiener–Hopf operators \( W \,=\,P_{2}A|{P_{1} X}\, \text{where}\, X, Y\) are Banach spaces, \( P_{1}\,\in\,\mathcal{L}(X) , P_{2}\,\in\,\mathcal{L}(Y)\) are any pro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92481d8d050b854ce9be93940b9304b3
https://doi.org/10.1007/978-3-030-04269-1_16
https://doi.org/10.1007/978-3-030-04269-1_16
Autor:
Frank-Olme Speck
Publikováno v:
Mathematical Methods in the Applied Sciences. 40:391-403
Motivated by the Sommerfeld diffraction problem, we consider interface problems for the n-dimensional Helmholtz equation in (due to xn>0 or xn
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::37ca4de753e9205c5a69ab677476dee5
https://doi.org/10.1002/mma.3386
https://doi.org/10.1002/mma.3386
Autor:
Luis P. Castro, Frank-Olme Speck
Publikováno v:
Recent Trends in Operator Theory and Partial Differential Equations ISBN: 9783319470771
Convolution type operators with symmetry appear naturally in boundary value problems for elliptic PDEs in symmetric or symmetrizable domains. They are defined as truncations of translation invariant operators in a scale of Sobolev-like spaces that ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e9f005d12aaadd94e02d6577dbea987b
http://hdl.handle.net/10773/17128
http://hdl.handle.net/10773/17128
Autor:
Frank-Olme Speck
Publikováno v:
Large Truncated Toeplitz Matrices, Toeplitz Operators, and Related Topics ISBN: 9783319491806
It happened on the 7th February 1989 in Karl-Marx-Stadt (KMS) when we met for the first time, a day which I remember with emotion. Somehow Albrecht reminded me on August den Starken (Augustus II the Strong, Elector of Saxony and King of Poland, 1670
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a9381b8ba639829153f4afc8bd56397
https://doi.org/10.1007/978-3-319-49182-0_4
https://doi.org/10.1007/978-3-319-49182-0_4
Autor:
Frank-Olme Speck
Publikováno v:
Large Truncated Toeplitz Matrices, Toeplitz Operators, and Related Topics ISBN: 9783319491806
Relations between paired and truncated operators acting in Banach spaces are generalized to asymmetric space settings, i.e., to matrix operators acting between different spaces. This allows more direct proofs and further results in factorization theo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce7be12b220ecaec04c62c26ebd528ad
https://doi.org/10.1007/978-3-319-49182-0_28
https://doi.org/10.1007/978-3-319-49182-0_28
Autor:
Frank-Olme Speck
Publikováno v:
Integral Equations and Operator Theory. 82:395-415
An operator factorization conception is investigated for a general Wiener–Hopf operator $${W = P_2 A |_{P_1 X}}$$ where X, Y are Banach spaces, $${P_1 \in \mathcal{L}(X), P_2 \in \mathcal{L}(Y)}$$ are projectors and $${A \in \mathcal{L}(X,Y)}$$ is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2beec8b220e628ab57bad3de05eadf46
https://doi.org/10.1007/s00020-014-2190-5
https://doi.org/10.1007/s00020-014-2190-5
Publikováno v:
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
This paper aims at the explicit analytical representation of acoustic, electromagnetic or elastic, time-harmonic waves diffracted from wedges in R3 in a correct setting of Sobolev spaces. Various problems are modelled by Dirichlet or Neumann boundary
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::61d640f88e28f7afdf81f19a90a8d21e
https://doi.org/10.7153/oam-08-17
https://doi.org/10.7153/oam-08-17
Autor:
Frank-Olme Speck
Publikováno v:
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik. 93:485-491
The modelling of diffraction of time-harmonic electromagnetic or acoustic waves from obstacles and screens leads to boundary value problems for the three-dimensional Helmholtz equation with Dirichlet, Neumann, or other conditions on the boundary. A p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::adb29b308a738340812f967caa6c4686
https://doi.org/10.1002/zamm.201100175
https://doi.org/10.1002/zamm.201100175