We reprove and slightly improve theorems of Nudelman and Stenger about compressions of maximal dissipative and self-adjoint operators to subspaces of finite codimension and discuss related results concerning the closedness and the adjoint of a product of two operators on a Hilbert space.</p
Abstract In this article, a new characterization of the closedness of the sum of two closed subspace...
For a {bounded} non-negative self-adjoint operator acting in a complex, infinite-dimensional, separa...
Abstract. It will be turned out that, given an operator inequality φ(T) ≥ ψ(T) for a tuple T of oper...
We reprove and slightly improve theorems of Nudelman and Stenger about compressions of maximal dissi...
In the first part of this note we give a rather short proof of a generalization of Stenger’s lemma a...
Theorems due to Stenger (Bull Am Math Soc 74:369-372, 1968) and Nudelman (Int Equ Oper Theory 70:301...
In this paper we generalize results from Stenger (1968) [30], Nudelman (2011) [28] and Azizov and Di...
Let S be a symmetric operator with finite and equal defect numbers in the Hilbert space . We study t...
The main result (roughly) is that if Hi converges weakly to H and if also f (Hi) converges weakly to...
In general, it is a non-trivial task to determine the adjoint (Formula presented.) of an unbounded o...
Abstract In this article, a new characterization of the closedness of the sum of two closed subspace...
For a {bounded} non-negative self-adjoint operator acting in a complex, infinite-dimensional, separa...
Abstract. It will be turned out that, given an operator inequality φ(T) ≥ ψ(T) for a tuple T of oper...
We reprove and slightly improve theorems of Nudelman and Stenger about compressions of maximal dissi...
In the first part of this note we give a rather short proof of a generalization of Stenger’s lemma a...
Theorems due to Stenger (Bull Am Math Soc 74:369-372, 1968) and Nudelman (Int Equ Oper Theory 70:301...
In this paper we generalize results from Stenger (1968) [30], Nudelman (2011) [28] and Azizov and Di...
Let S be a symmetric operator with finite and equal defect numbers in the Hilbert space . We study t...
The main result (roughly) is that if Hi converges weakly to H and if also f (Hi) converges weakly to...
In general, it is a non-trivial task to determine the adjoint (Formula presented.) of an unbounded o...
Abstract In this article, a new characterization of the closedness of the sum of two closed subspace...
For a {bounded} non-negative self-adjoint operator acting in a complex, infinite-dimensional, separa...
Abstract. It will be turned out that, given an operator inequality φ(T) ≥ ψ(T) for a tuple T of oper...
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