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Hassi, Seppo [Author]

A singular value decomposition of matrices in a space with an indefinite scalar product

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Helsinki: Suomalainen Tiedeakatemia, 1990

Published in: Suomalainen Tiedeakatemia: Annales Academiae Scientiarum Fennicae / A / 1 / Dissertationes ; 7900
Behrndt, Jussi [Author] ; Hassi, Seppo [Other]; de Snoo, Henk [Other]

Boundary Value Problems, Weyl Functions, and Differential Operators

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Cham: Springer Nature, 2020
Derkach, Volodymyr [Author]; Hassi, Seppo [Author]; Malamud, Mark [Author]

Generalized boundary triples, II : some applications of generalized boundary triples and form domain invariant Nevanlinna functions

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2022

Published in: Mathematische Nachrichten ; 295(2022), 6, Seite 1113-1162
Behrndt, Jussi [Author]; Hassi, Seppo [Author]; de Snoo, Henk [Author]

Boundary Value Problems, Weyl Functions, and Differential Operators - [1st ed. 2020.]

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Cham: Springer International Publishing, 2020 ; Cham: Imprint: Birkhäuser, 2020

Published in: Monographs in Mathematics ; 108 - Springer eBook Collection
Behrndt, Jussi [Author]; Hassi, Seppo [Author]; de Snoo, Henk [Author]

Boundary Value Problems, Weyl Functions, and Differential Operators

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Cham: Springer Nature, 2020

Published in: Monographs in Mathematics
Derkach, Volodymyr [Author]; Hassi, Seppo [Author]; Malamud, Mark [Author]

Generalized boundary triples, II : some applications of generalized boundary triples and form domain invariant Nevanlinna functions

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Ilmenau: Technische Universität Ilmenau, Institut für Mathematik, April 2021 ; Ilmenau: Universitätsbibliothek, April 2021

Published in: Technische Universität Ilmenau: Preprint ; 202103
Derkach, Volodymyr [Author]; Hassi, Seppo [Author]; Malamud, Mark [Author]

Generalized boundary triples, II.: Some applications of generalized boundary triples and form domain invariant Nevanlinna functions

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Digital Library Thüringen, 2021-04-20
Baidiuk, Dmytro [Author]; Derkach, Volodymyr [Author]; Hassi, Seppo [Author]

Unitary boundary pairs for isometric operators in Pontryagin spaces and generalized coresolvents

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2021

Published in: Complex analysis and operator theory ; 15(2021), 2, Artikel-ID 32
Baidiuk, Dmytro [Author]; Derkach, Volodymyr [Author]; Hassi, Seppo [Author]

Unitary boundary pairs for isometric operators in Pontryagin spaces and generalized coresolvents

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Digital Library Thüringen, 2021-02-01
Fleige, Andreas [Author]; Hassi, Seppo [Author]; Snoo, Henk de [Author]; Winkler, Henrik [Author]

Non-semibounded closed symmetric forms associated with a generalized Friedrichs extension

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Digital Library Thüringen, 2013-11-22
Fleige, Andreas [Other]; Hassi, Seppo [Other]; Snoo, Hendrik S. V. de [Other]; Winkler, Henrik [Other]

Non-semibounded closed symmetric forms associated with a generalized Friedrichs extension

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Ilmenau: Techn. Univ., Inst. für Mathematik, 2013

Published in: Technische Universität Ilmenau: Preprint ; 201317
Winkler, Henrik [Other]; Behrndt, Jussi [Other]; Hassi, Seppo [Other]; Snoo, Hendrik S. V. de [Other]; Wietsma, Rudi [Other]

Linear fractional transformations of Nevanlinna functions associated with a nonnegative operator

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Ilmenau: Techn. Univ., Inst. für Mathematik, 2011

Published in: Technische Universität Ilmenau: Preprint ; 201118
Behrndt, Jussi [Author]; Hassi, Seppo [Author]; Snoo, Henk de [Author]; Wietsma, Rudi [Author]; Winkler, Henrik [Author]

Linear fractional transformations of Nevanlinna functions associated with a nonnegative operator

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Digital Library Thüringen, 2011-12-13
Hassi, Seppo

A Class of Nevanlinna Functions Related to Singular Sturm-Liouville Problems

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American Mathematical Society, 2006

Published in: Proceedings of the American Mathematical Society, 134 (2006) 10, Seite 2885-2893
Arlinskiĭ, Yury; Hassi, Seppo

Stieltjes and inverse Stieltjes holomorphic families of linear relations and their representations

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Institute of Mathematics, Polish Academy of Sciences, 2020

Published in: Studia Mathematica, 252 (2020) 2, Seite 129-167
Baidiuk, Dmytro; Hassi, Seppo

Completion, extension, factorization, and lifting of operators

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Springer Science and Business Media LLC, 2016

Published in: Mathematische Annalen, 364 (2016) 3-4, Seite 1415-1450
Hassi, Seppo; Kuzhel, Sergii

On J-self-adjoint operators with stable C-symmetries

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Cambridge University Press (CUP), 2013

Published in: Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 143 (2013) 1, Seite 141-167
Hassi, Seppo; Kuzhel, Sergii

On symmetries in the theory of finite rank singular perturbations

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Elsevier BV, 2009

Published in: Journal of Functional Analysis, 256 (2009) 3, Seite 777-809
Hassi, Seppo; Oridoroga, Leonid

Theorem of Completeness for a Dirac-Type Operator with Generalized λ-Depending Boundary Conditions

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Springer Science and Business Media LLC, 2009

Published in: Integral Equations and Operator Theory, 64 (2009) 3, Seite 357-379
Derkach, Vladimir; Hassi, Seppo

A Reproducing Kernel Space Model for N<sub>κ</sub>-Functions

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American Mathematical Society, 2003

Published in: Proceedings of the American Mathematical Society, 131 (2003) 12, Seite 3795-3806

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