On the hamiltonian–krein index for a non-self-adjoint spectral problem characteristics of the 1-D Schrödinger
operator HV= (Equation presented). © 2018 American Mathematical Society.
Scattering matrices and Dirichlet-to-Neumann maps self-adjoint operators in terms of an abstract
operator valued Titchmarsh–Weyl m-function is proved
To the theory of operator monotone and operator convex functions monotone in the sense of the natural order on the set of positive
self-adjoint operators affiliated
On invertibility of some operator sums, Y ∈ B(H) be
self-adjoint operators, X ≥ 0 and X ≤ Y ≤ X. If Y is invertible, then X is also
McLaughlin’s Inverse Problem for the Fourth-Order Differential Operator of the coefficients nor the
self-adjointness of the
operator. In addition, we establish the connection between Mc
More accurate classes of jensen–type inequalities for convex and operator convex functions, in this paper we develop a general method for improving two classes of Jensen-type inequalities for bounded
self-adjoint On Kernels of Invariant Schrödinger Operators with Point Interactions. Grinevich–Novikov ConjectureAccording to Berezin and Faddeev, a Schrödinger
operator with point interactions –Δ + is any
self-adjoint