s-Numbers of operators in Banach spaces
Sobczyk's theorem and the Bounded Approximation Property
Sobczyk's theorem asserts that every c₀-valued operator defined on a separable Banach space can be extended to every separable superspace. This paper is devoted to obtaining the most general vector valued version of the theorem, extending and completing previous results of Rosenthal, Johnson-Oikhberg and Cabello. Our approach is homological and nonlinear, transforming the problem of extension of operators into the problem of approximating z-linear maps by linear maps.
Sobolev multipliers
Sobolev spaces of integer order on compact homogeneous manifolds and invariant differential operators
Let be a Riemannian manifold, which possesses a transitive Lie group of isometries. We suppose that , and therefore , are compact and connected. We characterize the Sobolev spaces
Sobolev- und Sobolev-Hardy-Räume auf S1: Dualitätstheorie und Funktionalkalküle.
Sobre algunas propiedades de espacios de Banach.
Sobre Ciertos Espacios De Funciones Holo Morfas Y Sus Aplicaciones, II.
Sobre el espectro de derivaciones y automorfismos de las álgebras de Banach.
Sobre La Cohomologia Asociada A Un Operador Lineal Diferencial Complejo.
Sobre la ecuación cuadrática en operadores A + BT +TC + TDT = 0.
By means of the application of annihilating entire functions of an operator, the bilateral quadratic equation in operators A + BT +TC + TDT = 0, is changed into an unilateral linear equation, obtaining conditions under which the solutions of such linear equation satisfy the quadratic equation.
Sobre la estructura de los espacios de operadores de Lorentz.
Sobre la topología débil en componentes del ideal de los operadores p-compactos de Saphar con 1 < p < ∞.
Sobre los espacios de Banach que contienen a l1 como complementado.
Sobre los espacios Frechet-Schwartz de dimensión diametral máxima.
Sobre los operadores desplazamiento bilateral ponderados e invertibles.
In this paper the analytic-spectral structure of the commutant of an invertible bilateral weighted shift operator is studied, extending known results. A class of operators is introduced, more general than the class of the rationally strictly cyclic bilateral shift [operators] which are not unicellular.
Sobre los operadores desplazamiento ponderados sub-acotados.
We study the relation between the sets of cyclic vectors of an unilateral bounded below weighted shift operator T and T|S where S is an invariant subspace of T. It is proved that T can not be unicellular and known results are generalized.
Sobre operadores de integración fraccional y algoritmos computacionales
Software cost estimation with fuzzy inputs: Fuzzy modelling and aggregation of cost drivers
Parametric software cost estimation models are well-known and widely used estimation tools, and several fuzzy extensions have been proposed to introduce a explicit handling of imprecision and uncertainty as part of them. Nonetheless, such extensions do not consider two basic facts that affect the inputs of software cost parametric models: cost drivers are often expressed through vague linguistic categories, and in many cases cost drivers are better expressed in terms of aggregations of second-level...
Sojourn times of trapping rays and the behavior of the modified resolvent of the laplacian
Solitary waves for a coupled nonlinear Schrödinger system with dispersion management.