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Neidhardt, Hagen (19)
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Institut für Mathematik
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Trotter-Kato product formula and symmetrically-normed ideals
(1998)
Neidhardt, Hagen
;
Zagrebnov, Valentin A.
Trotter-Kato product formula and operator-norm convergence
(1999)
Neidhardt, Hagen
;
Zagrebnov, Valentin A.
Towards the right Hamiltonians for singular perturbations via regularization and extension theory
(1996)
Neidhardt, Hagen
;
Zagrebnov, Valentin A.
Some remarks to Krein's extension theory
(1994)
Brasche, Johannes F.
;
Neidhardt, Hagen
Some new aspects of Krein's extension theory
(1994)
Brasche, Johannes F.
;
Koshmanenko, V. D.
;
Neidhardt, Hagen
Singular perturbations, regularization and extension theory
(1994)
Neidhardt, Hagen
;
Zagrebnov, Valentin A.
On the singular continuous spectrum of self-adjoint extensions
(1996)
Brasche, Johannes F.
;
Neidhardt, Hagen
On the right Hamiltonian for the singular perturbations : general theory
(1997)
Neidhardt, Hagen
;
Zagrebnov, Valentin A.
On the point spectrum of selfadjoint extensions
(1995)
Brasche, Johannes F.
;
Neidhardt, Hagen
On the absolutely continuous subspace for non-selfadjoint operators
(1996)
Adamyan, Vadim M.
;
Neidhardt, Hagen
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