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Boundary value problems, Weyl functions, and differential operators
(Birkhäuser, Cham, 2020)
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 as range perturbations in a Pontryagin space
(Vaasan yliopisto, 2003)
Singular perturbations of selfadjoint operators
(Vaasan yliopisto, 2002)