On joint spectra of operators on a Banach space isomorphic to its square
On joint spectra of pairs of analytic Toeplitz operators
One computes the joint and essential joint spectra of a pair of multiplication operators with bounded analytic functions on the Hardy spaces of the unit ball in .
On -quasiclass operators.
On Kato non-singularity
An exactness lemma offers a simplified account of the spectral properties of the "holomorphic" analogue of normal solvability.
On -quasi-derivatives for solutions of perturbed general quasi-differential equations
This paper is concerned with square integrable quasi-derivatives for any solution of a general quasi-differential equation of th order with complex coefficients , provided that all th quasi-derivatives of solutions of and all solutions of its normal adjoint are in and under suitable conditions on the function .
On Lattice Isomorphisms with Positive Real Spectrum and Groups of Positive Operators.
On L...-decay and scattering for nonlinear Klein-Gordon equations.
On limits of -norms of an integral operator
A recurrence relation for the computation of the -norms of an Hermitian Fredholm integral operator is derived and an expression giving approximately the number of eigenvalues which in absolute value are equal to the spectral radius is determined. Using the -norms for the approximation of the spectral radius of this operator an a priori and an a posteriori bound for the error are obtained. Some properties of the a posteriori bound are discussed.
On linear operators having supercyclic vectors
We show that for a real separable Banach space X there are operators in B(X) having supercyclic vectors if and only if dim X ≤ 2 or dim X = ∞.
On local joint capacities of operators
On local spectral properties of operators in Banach spaces
On local spectral radius
On Minimizing ||S−(AX−XB)||Pp
In this paper, we minimize the map Fp (X)= ||S−(AX−XB)||Pp , where the pair (A, B) has the property (F P )Cp , S ∈ Cp , X varies such that AX − XB ∈ Cp and Cp denotes the von Neumann-Schatten class.
On minimizing the norm of linear maps in -classes.
On Morozov's method for Tikhonov regularization as an optimal order yielding algorithm.
On multiparameter spectral theory.
On Multiplicative Lebesgue Integration and Families of Evolution Operators.
On Nambu bracket representations of 3-algebras.
On nets of local algebras on , covariant with respect to the discrete Poincaré group ; causality and scattering theory
On Neumann operators.