Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Seppo Hassi"'
Autor:
Seppo Hassi, Hendrik Luit Wietsma
Publikováno v:
Opuscula Mathematica, Vol 36, Iss 6, Pp 749-768 (2016)
Minimal realizations of generalized Nevanlinna functions that carry the information on their generalized poles of nonpositive type in an explicit form are established. These realizations are based on a modification of the basic canonical factorizatio
Externí odkaz:
https://doaj.org/article/ee47328ba4a84ea6a27079e65a17da37
Publikováno v:
Opuscula Mathematica, Vol 28, Iss 3, Pp 233-245 (2008)
The class of Nevanlinna families consists of \(\mathbb{R}\)-symmetric holomorphic multivalued functions on \(\mathbb{C} \setminus \mathbb{R}\) with maximal dissipative (maximal accumulative) values on \(\mathbb{C}_{+}\) (\(\mathbb{C}_{-}\), respectiv
Externí odkaz:
https://doaj.org/article/29547fd7a1f643958672fe6d3ed02fbc
This open access book presents a comprehensive survey of modern operator techniques for boundary value problems and spectral theory, employing abstract boundary mappings and Weyl functions. It includes self-contained treatments of the extension theor
Presented in this volume are a number of new results concerning the extension theory and spectral theory of unbounded operators using the recent notions of boundary triplets and boundary relations. This approach relies on linear single-valued and mul
Autor:
Seppo Hassi, Henk De Snoo
Publikováno v:
Acta scientiarum mathematicarum, 88(1-2), 469-503. UNIV SZEGED, BOLYAI INSTITUTE
For a pair of bounded linear Hilbert space operators A and B one considers the Lebesgue type decompositions of B with respect to A into an almost dominated part and a singular part, analogous to the Lebesgue decomposition for a pair of measures in wh
Publikováno v:
Mathematische Nachrichten. 295:1113-1162
Publikováno v:
Advances in Operator Theory, 5(3), 1193-1228. SPRINGER BASEL AG
Columns and rows are operations for pairs of linear relations in Hilbert spaces, modelled on the corresponding notions of the componentwise sum and the usual sum of such pairs. The introduction of matrices whose entries are linear relations between u
Publikováno v:
Mathematische Nachrichten. 293:1278-1327
With a closed symmetric operator A in a Hilbert space H a triple Π={H,Γ0,Γ1} of a Hilbert space H and two abstract trace operators Γ0 and Γ1 from A∗ to H is called a generalized boundary triple for A∗ if an abstract analogue of the second Gr
An isometric operator V in a Pontryagin space H is called standard, if its domain and the range are nondegenerate subspaces in H. A description of coresolvents for standard isometric operators is known and basic underlying concepts that appear in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eaea919437d51da53ccb41659c7c9f41
http://arxiv.org/abs/2012.13812
http://arxiv.org/abs/2012.13812
Publikováno v:
Boundary Value Problems, Weyl Functions, and Differential Operators ISBN: 9783030367138
For the multi-dimensional Schrodinger operator -∆+V with a bounded real potential V on a bounded domain \( \varOmega \subset {\mathbb{R}}^{n} \) with a C2-smooth boundary a boundary triplet and a Weyl function will be constructed.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::78e1a17fef90fee51ffa9a35abba6820
https://doi.org/10.1007/978-3-030-36714-5_9
https://doi.org/10.1007/978-3-030-36714-5_9