A family of selfadjoint operators of the Friedrichs model is considered. These symmetric type operators have one singular point, zero of order m. For every m> 3/2, we construct a rank 1 perturbation from the class Lip1 such that the corresponding operator has a sequence of eigenvalues converging to zero. Thus, near the singular point, there is no singular spectrum finiteness condition in terms of a modulus of continuity of a perturbation for these operators in case ofm> 3/2
Abstract. The study of the point spectrum and the singular continuous one is reduced to investigatin...
The study of the point spectrum and the singular continuous one is reduced to investigating the stru...
AbstractNonself-adjoint, nondissipative perturbations of bounded self-adjoint operators with real pu...
A family of selfadjoint operators of the Friedrichs model is considered. These symmetric type operat...
Abstract. Problems of existence of the singular spectrum on the continuous spectrum emerges in some ...
Singular finite rank perturbations of an unbounded self-adjoint operator A0 in a Hilbert space h0 ar...
Singular finite rank perturbations of an unbounded self-adjoint operator A0 in a Hilbert space h0 ar...
The object of this study is the Friedrichs model in the case of one-dimensional perturbation of the ...
The object of this study is the Friedrichs model in the case of one-dimensional perturbation of the ...
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...
AbstractIt was shown by P. Jonas and H. Langer that a selfadjoint definitizable operator A in a Krei...
Let A be a selfadjoint operator in a Hilbert space-9. Its rank one perturbations A + r(., co)co, T E...
We study spectral properties of one-dimensional singular nonselfadjoint perturbations of an unbounde...
AbstractFor a nonnegative self-adjoint operator A0 acting on a Hilbert space H singular perturbation...
Abstract. The study of the point spectrum and the singular continuous one is reduced to investigatin...
The study of the point spectrum and the singular continuous one is reduced to investigating the stru...
AbstractNonself-adjoint, nondissipative perturbations of bounded self-adjoint operators with real pu...
A family of selfadjoint operators of the Friedrichs model is considered. These symmetric type operat...
Abstract. Problems of existence of the singular spectrum on the continuous spectrum emerges in some ...
Singular finite rank perturbations of an unbounded self-adjoint operator A0 in a Hilbert space h0 ar...
Singular finite rank perturbations of an unbounded self-adjoint operator A0 in a Hilbert space h0 ar...
The object of this study is the Friedrichs model in the case of one-dimensional perturbation of the ...
The object of this study is the Friedrichs model in the case of one-dimensional perturbation of the ...
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...
AbstractIt was shown by P. Jonas and H. Langer that a selfadjoint definitizable operator A in a Krei...
Let A be a selfadjoint operator in a Hilbert space-9. Its rank one perturbations A + r(., co)co, T E...
We study spectral properties of one-dimensional singular nonselfadjoint perturbations of an unbounde...
AbstractFor a nonnegative self-adjoint operator A0 acting on a Hilbert space H singular perturbation...
Abstract. The study of the point spectrum and the singular continuous one is reduced to investigatin...
The study of the point spectrum and the singular continuous one is reduced to investigating the stru...
AbstractNonself-adjoint, nondissipative perturbations of bounded self-adjoint operators with real pu...