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Mostrando ítems 11-20 de 34
Artículo
Some revisited results about composition operators on Hardy spaces
(European Mathematical Society, 2012)
We generalize, on one hand, some results known for composition operators on Hardy spaces to the case of Hardy-Orlicz spaces HΨ: construction of a “slow” Blaschke product giving a non-compact composition operator on ...
Ponencia
Artículo
Furstenberg sets for a fractal set of directions
(American Mathematical Society, 2012-08)
In this paper we study the behavior of the size of Furstenberg sets with respect to the size of the set of directions defining it. For any pair α, β ∈ (0, 1], we will say that a set E ⊂ R2 is an Fαβ-set if there is a subset ...
Artículo
Sharp weighted estimates for classical operators
(Elsevier, 2012-01-15)
We prove sharp one and two-weight norm inequalities for some of the classical operators of harmonic analysis: the Hilbert and Riesz transforms, the Beurling-Ahlfors operator, the maximal singular integrals associated to ...
Ponencia
Artículo
Spectral properties of certain tridiagonal matrices
(Elsevier, 2012-02-01)
We study spectral properties of irreducible tridiagonal k−Toeplitz matrices and certain matrices which arise as perturbations of them.
Artículo
Sharp reverse Hölder property for A∞ weights on spaces of homogeneous type
(Elsevier, 2012-12-15)
In this article we present a new proof of a sharp Reverse Hölder Inequality for A∞ weights. Then we derive two applications: a precise open property of Muckenhoupt classes and, as a consequence of this last result, we ...
Artículo
Right Bregman nonexpansive operators in Banach spaces
(Elsevier, 2012-09)
We introduce and study new classes of Bregman nonexpansive operators in reflexive Banach spaces. These classes of operators are associated with the Bregman distance induced by a convex function. In particular, we characterize ...
Artículo
Some bounds and limits in the theory of Riemann's zeta function
(Elsevier, 2012-12-01)
For any real a > 0 we determine the supremum of the real σ such that ζ(σ+it) = a for some real t. For 0 < a < 1, a = 1, and a > 1 the results turn out to be quite different. We also determine the supremum E of the real ...