3 citations · 9 across the 7 of their papers we have counts for
4 papers · 1 filter
Completeness property of one-dimensional perturbations of normal and spectral operators generated by first order systems
Anton A. Lunyov, Mark M. Malamud
The paper is concerned with completeness property of rank one perturbations of unperturbed operators generated by special boundary value problems (BVP) for the following $2 \times…
Krein extension of a differential operator of even order
Yaroslav Granovskyi, Leonid Oridoroga
We describe the Krein extension of minimal operator associated with the expression A:=(-1)^n*d^(2n)/dx^(2n) on a finite interval (a,b) in terms of boundary conditions. All non-nega…
On the completeness of the system of root vectors for first-order systems
M. M. Malamud, L. L. Oridoroga
The paper is concerned with the completeness problem of root functions of general boundary value problems for first order systems of ordinary differential equations. Namely, we int…
On the Negative Spectrum of One-Dimensional Schrödinger Operators with Point Interactions
Nataly Goloschapova, Leonid Oridoroga
We investigate negative spectra of 1--D Schrödinger operators with - and -interactions on a discrete set in the framework of a new approach. Namely, using technique of bound…