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Infinite-dimensional perturbations, maximally nondensely defined symmetric operators, and some matrix representations
(ElsevierRoyal Netherlands Academy of Arts and Sciences (KNAW), 2012-12)
- article
The notion of a maximally nondensely defined symmetric operator or relation is introduced and characterized. The selfadjoint extensions (including the generalized Friedrichs extension) of a class of maximally nondensely ...
Generalized boundary triples, II. Some applications of generalized boundary triples and form domain invariant Nevanlinna functions
(Wiley, 2022-05-12)
- article
The paper is a continuation of Part I and contains several further results on generalized boundary triples, the corresponding Weyl functions, and applications of this technique to ordinary and partial differential operators. ...
Boundary value problems, Weyl functions, and differential operators
(Birkhäuser, Cham, 2020)
- book
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 ...
Singular perturbations of selfadjoint operators
(Vaasan yliopisto, 2002)
- workingPaper
Singular perturbations as range perturbations in a Pontryagin space
(Vaasan yliopisto, 2003)
- workingPaper