On a certain algorithm of eigenvalue localization for normal operators
On a certain class of always convergent sequences and the Rayleigh quotient iterations
On a certain class of nonstationary sequences in Hilbert space.
On a class of -contractions: hyperinvariant subspaces and intertwining operators.
On a class of nonlinear eigenvalue problems
On a Class of Normaloid Operators.
On a class of operators
On a Class of Time Inhomogeneous Nonsingular Flows and Schrödinger Operators.
On a class of Toeplitz + Hankel operators.
On a completion of prehilbertian spaces.
On a -parameter ergodic theorem for continuous semigroups of operators satisfying norm conditions
A continuous multiparameter version of Chacon's vector valued ergodic theorem is proved.
On a decomposition for pairs of commuting contractions
A new decomposition of a pair of commuting, but not necessarily doubly commuting contractions is proposed. In the case of power partial isometries a more detailed decomposition is given.
On a Five-Diagonal Jacobi Matrices and Orthogonal Polynomials on Rays in the Complex Plane
∗ Partially supported by Grant MM-428/94 of MESC.Systems of orthogonal polynomials on the real line play an important role in the theory of special functions [1]. They find applications in numerous problems of mathematical physics and classical analysis. It is known, that classical polynomials have a number of properties, which uniquely define them.
On a fixed-point theorem of Cellina
In questa nota mostriamo come un teorema di esistenza per funzionali lineari porti un nuovo teorema di punto fisso che generalizza un teorema di punto fisso di Cellina.
On a formula for the jumps in the semi-Fredholm domain.
In this paper we prove some properties of the lower s-numbers and derive asymptotic formulae for the jumps in the semi-Fredholm domain of a bounded linear operator on a Banach space.
On a general bidimensional extrapolation problem
Several generalized moment problems in two dimensions are particular cases of the general problem of giving conditions that ensure that two isometries, with domains and ranges contained in the same Hilbert space, have commutative unitary extensions to a space that contains the given one. Some results concerning this problem are presented and applied to the extension of functions of positive type.
On a generalization of Lumer-Phillips' theorem for dissipative operators in a Banach space
Using [1], which is a local generalization of Gelfand's result for powerbounded operators, we first give a quantitative local extension of Lumer-Philips' result that states conditions under which a quasi-nilpotent dissipative operator vanishes. Secondly, we also improve Lumer-Phillips' theorem on strongly continuous semigroups of contraction operators.
On a Hilbert-type integral inequality in the subinterval and its operator expression.
On a Hilbert-type operator with a symmetric homogeneous kernel of -order and applications.
On a Jensen-Mercer operator inequality.