About some linear operators.
About the adiabatic stability of resonant states
About the class of ordered limited operators
We give a brief survey of recent results of order limited operators related to some properties on Banach lattices.
About the existence of integrable solutions of a functional-integral equation.
We improve (in some sense) a recent theorem due to Banas and Knap (1989) about the existence of integrable solutions of a functional-integral equation.
About the generating function of a left bounded integer-valued random variable
We give a relation between the sign of the mean of an integer-valued, left bounded, random variable and the number of zeros of inside the unit disk, where is the generating function of , under some mild conditions
About the inverse operations on the hyperespace of nonlinear monotone operators.
About the Resolvent of an Operator from Fluid Dynamics.
A-Browder-type theorems for direct sums of operators
We study the stability of a-Browder-type theorems for orthogonal direct sums of operators. We give counterexamples which show that in general the properties , , and are not preserved under direct sums of operators. However, we prove that if and are bounded linear operators acting on Banach spaces and having the property , then has the property if and only if , where is the upper semi-B-Weyl spectrum of . We obtain analogous preservation results for the properties , and with...
Abschätzungen für den zweiten Eigenwert eines positiven Operators.
Abschnittzerlegungen bei oberen Schranken für Eigenwerte von Operatorpolynomen.
absence de résonance près du réel pour l’opérateur de Schrödinger
On donne dans cet exposé des bornes inférieures universelles, en limite semiclassique, de la hauteur des résonances de forme associées aux opérateurs de Schrödinger à l’extérieur d’obstacles avec des conditions au bord de Dirichlet ou de Neumann et des potentiels analytiquement dilatables et tendant vers à l’infini. Ces bornes inférieures sont exponentiellement petites par rapport à la constante de Planck.
Absence of eigenvalues for integro-differential operators with periodic coefficients.
Absence of point spectrum for a class of discrete Schrödinger operators with quasiperiodic potential.
Absence of the singular continuous component in the spectrum of analytic direct integrals.
Absolute and Ordinary Köthe-Toeplitz Duals of Some Sets of Sequences and Matrix Transformations
Absolute continuity and hyponormal operators.
Absolute continuity for Jacobi matrices with power-like weights
This work deals with a class of Jacobi matrices with power-like weights. The main theme is spectral analysis of matrices with zero diagonal and weights where α ∈ (0,1]. Asymptotic formulas for generalized eigenvectors are given and absolute continuity of the matrices considered is proved. The last section is devoted to spectral analysis of Jacobi matrices with qₙ = n + 1 + (-1)ⁿ and .
Absolute Continuity of the Essential Spectrum of - ... + q (t) without Monotony of q.
Absolutely continuous and singular spectral shift functions [Book]
Absolutely continuous linear operators on Köthe-Bochner spaces
Let E be a Banach function space over a finite and atomless measure space (Ω,Σ,μ) and let and be real Banach spaces. A linear operator T acting from the Köthe-Bochner space E(X) to Y is said to be absolutely continuous if whenever μ(Aₙ) → 0, (Aₙ) ⊂ Σ. In this paper we examine absolutely continuous operators from E(X) to Y. Moreover, we establish relationships between different classes of linear operators from E(X) to Y.