Extensions of positive operators and extreme points. IV
Extensions of some Fixed Point Theorems of Rhoades, Ćirić, Maiti and Pal
Extensions of symmetric operators I: The inner characteristic function case
Given a symmetric linear transformation on a Hilbert space, a natural problem to consider is the characterization of its set of symmetric extensions. This problem is equivalent to the study of the partial isometric extensions of a fixed partial isometry. We provide a new function theoretic characterization of the set of all self-adjoint extensions of any symmetric linear transformation B with finite equal indices and inner Livšic characteristic function θB by constructing a bijection between the...
Extensions of the representation theorems of Riesz and Fréchet
We present two types of representation theorems: one for linear continuous operators on space of Banach valued regulated functions of several real variables and the other for bilinear continuous operators on cartesian products of spaces of regulated functions of a real variable taking values on Banach spaces. We use generalizations of the notions of functions of bounded variation in the sense of Vitali and Fréchet and the Riemann-Stieltjes-Dushnik or interior integral. A few applications using geometry...
Extensions of the results on powers of -hyponormal and -hyponormal operators.
Extensions of two classic kinds of Wachs space operators
Extensions of Two Fixed Point Theorems of Ky Fan.
Extensions uniformes des opérateurs positifs
External approximation of bifurcation problems
External approximation of eigenvalue problems in Banach spaces
Extrapolation and sharp norm estimates for classical operators on weighted Lebesgue spaces.
Extrapolation methods to solve non-autonomous retarded partial differential equations
Using extrapolation spaces introduced by Da Prato-Grisvard and Nagel we prove a non-autonomous perturbation theorem for Hille-Yosida operators. The abstract result is applied to non-autonomous retarded partial differential equations.
Extrapolation pour les mesures de Carleson et conjecture de Kato
Extremal Maps of a Hilbert Space Equipped with a Natural Cone.
Extremal non-compactness of weighted composition operators on the disk algebra
Extremal operators and oblique projections
Extremal perturbations of semi-Fredholm operators
Let T be a bounded operator on an infinite-dimensional Banach space X and Ω a compact subset of the semi-Fredholm domain of T. We construct a finite rank perturbation F such that min[dim N(T+F-λ), codim R(T+F-λ)] = 0 for all λ ∈ Ω, and which is extremal in the sense that F² = 0 and rank F = max{min[dim N(T-λ), codim R(T-λ)] : λ ∈ Ω.
Extremal problems for completely positive maps.
Extremal properties of contraction semigroups on c0 .
Extremal solutions to a class of multivalued integral equations in Banach space.