Add to ORKGWe formulate an abstract result concerning the definitizability of J-selfadjoint operators which, roughly speaking, differ by at most finitely many dimensions from the orthogonal sum of a J-selfadjoint operator with finitely many negative squares and a semibounded selfadjoint operator in a Hilbert space. The general perturbation result is applied to a class of singular Sturm-Liouville operators with indefinite weight functions
AbstractWe show that any self-adjoint operator A (bounded or unbounded) in a Hilbert space H=(V,(·,·...
We consider a singular Sturm-Liouville expression with the indefinite weight sgn x. To this expressi...
This book exposes the internal structure of non-self-adjoint operators acting on complex separable i...
AbstractIn this paper we develop a perturbation approach to investigate spectral problems for singul...
Abstract In this paper we develop a perturbation approach to investigate spectral problems for singu...
AbstractIt was shown by P. Jonas and H. Langer that a selfadjoint definitizable operator A in a Krei...
We improve known perturbation results for self-adjoint operators in Hilbert spaces and prove spectra...
We consider a singular Sturm-Liouville differential expression with an indefinite weight function an...
AbstractTo a densely defined, but not necessarily selfadjoint, operator A on a Hilbert space H we co...
AbstractIn the past several years, there has been considerable progress made on a general left-defin...
AbstractThe number of negative squares of all self-adjoint extensions of a simple symmetric operator...
Abstract. We consider examples of operators that act in some Hilbert rigging from positive Hilbert s...
Let A be a selfadjoint operator in a Hilbert space-9. Its rank one perturbations A + r(., co)co, T E...
Let A be a selfadjoint operator in a Hilbert space h. Its rank one perturbations A+τ(·,ω)ω, τ ∈ R, a...
Let A be a selfadjoint operator in a Hilbert space h. Its rank one perturbations A+τ(·,ω)ω, τ ∈ R, a...
AbstractWe show that any self-adjoint operator A (bounded or unbounded) in a Hilbert space H=(V,(·,·...
We consider a singular Sturm-Liouville expression with the indefinite weight sgn x. To this expressi...
This book exposes the internal structure of non-self-adjoint operators acting on complex separable i...
AbstractIn this paper we develop a perturbation approach to investigate spectral problems for singul...
Abstract In this paper we develop a perturbation approach to investigate spectral problems for singu...
AbstractIt was shown by P. Jonas and H. Langer that a selfadjoint definitizable operator A in a Krei...
We improve known perturbation results for self-adjoint operators in Hilbert spaces and prove spectra...
We consider a singular Sturm-Liouville differential expression with an indefinite weight function an...
AbstractTo a densely defined, but not necessarily selfadjoint, operator A on a Hilbert space H we co...
AbstractIn the past several years, there has been considerable progress made on a general left-defin...
AbstractThe number of negative squares of all self-adjoint extensions of a simple symmetric operator...
Abstract. We consider examples of operators that act in some Hilbert rigging from positive Hilbert s...
Let A be a selfadjoint operator in a Hilbert space-9. Its rank one perturbations A + r(., co)co, T E...
Let A be a selfadjoint operator in a Hilbert space h. Its rank one perturbations A+τ(·,ω)ω, τ ∈ R, a...
Let A be a selfadjoint operator in a Hilbert space h. Its rank one perturbations A+τ(·,ω)ω, τ ∈ R, a...
AbstractWe show that any self-adjoint operator A (bounded or unbounded) in a Hilbert space H=(V,(·,·...
We consider a singular Sturm-Liouville expression with the indefinite weight sgn x. To this expressi...
This book exposes the internal structure of non-self-adjoint operators acting on complex separable i...