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Mostrando ítems 171-178 de 178
Ponencia
Uniform approximation of continuous functions by smooth functions with no critical points on Hilbert manifolds
(2001)
We prove that every continuous function on a separable infinitedimensional Hilbert space X can be uniformly approximated by C∞ smooth functions with no critical points. This kind of result can be regarded as a sort of ...
Artículo
Simultaneously maximal radial cluster sets
(Elsevier, 2005-07)
In this paper, we show that for a wide class of operators T –including infi- nite order differential operators, and multiplication and composition operators– acting on the space H(D) of holomorphic functions in the unit ...
Artículo
Some examples of compact composition operators on H2
(Elsevier, 2008-12-01)
We construct, in an essentially explicit way, various composition operators on H2 and study their compactness or their membership in the Schatten classes. We construct: non-compact composition operators on H2 whose symbols ...
Artículo
On the Krall-type discrete polynomials
(Elsevier, 2004-07-01)
In this paper we present a unified theory for studying the so called Kralltype discrete orthogonal polynomials. In particular, the three-term recurrence relation, lowering and raising operators as well as the second order ...
Artículo
Strongly omnipresent operators: general conditions and applications to composition operators
(Cambridge University Press, 2002-06)
This paper studies the concept of strongly omnipresent operators that was recently introduced by the first two authors. An operator T on the space H(G) of holomorphic functions on a complex domain G is called strongly ...
Tesis Doctoral
Propiedades diferenciales de familias de polinomios ortogonales matriciales y aplicaciones
(2008-02-01)
Una de las vías más fructíferas de aplicación de la teoría de polinomios ortogonales se produce a través de las ecuaciones diferenciales de segundo orden satisfechas por las familias clásicas de Hermite, Laguerre y Jacobi. ...
Artículo
Existence and nonexistence of hypercyclic semigroups
(American Mathematical Society, 2007-03)
In these notes we provide a new proof of the existence of a hypercyclic uniformly continuous semigroup of operators on any separable infinitedimensional Banach space that is very different from –and considerably shorter than– ...
Tesis Doctoral