This paper has two main goals. First, we are concerned with a description of all self-adjoint
extensions of the Laplacian-Δ| _ C_0^ ∞ (Ω) in L 2 (Ω; dnx). Here, the domain Ω belongs to …

We study spectral properties for HK, Ω, the Krein–von Neumann extension of the perturbed
Laplacian− Δ+ V defined on C0∞(Ω), where V is measurable, bounded and nonnegative, in …

In the first (and abstract) part of this survey we prove the unitary equivalence of the inverse of
the Krein–von Neumann extension (on the orthogonal complement of its kernel) of a densely …

All self-adjoint extensions of minimal linear relation associated with the discrete symplectic
system are characterized. Especially, for the scalar case on a finite discrete interval some …

The orthogonal polynomials with recurrence relationand the three kinds of cubic transition
ratescorrespond to indeterminate Stieltjes moment problems. It follows that the polynomials …

In this paper we consider a linear operator on an unbounded interval associated with a
matrix linear Hamiltonian system. We characterize its Friedrichs extension in terms of the …

The existence of a densely defined operator associated with (time-reversed) discrete
symplectic systems is discussed and the necessity of the development of the spectral theory …

Friedrichs extension of operators defined by symmetric banded matrices Page 1 Linear Algebra
and its Applications 430 (2009) 1966–1975 Contents lists available at ScienceDirect Linear …

A family T (ν), ν∈ ℝ, of semiinfinite positive Jacobi matrices is introduced with matrix entries
takenfrom the Hahn-Exton q-difference equation. The corresponding matrix operators …

A space of positive boundary values is constructed for a positive definite minimal symmetric
operator generated by an infinite Jacobi matrix in limit-circle case. A description of all …