Extensions of Rubio de Francia's extrapolation theorem
- Martell Berrocal, José María
- Pérez Moreno, Carlos
- Cruz-Uribe, David
ISSN: 0010-0757
Año de publicación: 2006
Título del ejemplar: Proceedings of the 7th International Conference on Harmonic Analysis and Partial Differential Equations
Volumen: 57
Fascículo: 1
Páginas: 195-231
Tipo: Artículo
Otras publicaciones en: Collectanea mathematica
Resumen
One of the main results in modern harmonic analysis is the extrapolation theorem of J.L. Rubio de Francia for Ap weights. In this paper we discuss some recent extensions of this result. We present a new approach that, among other things, allows us to obtain estimates in rearrangement-invariant Banach function spaces as well as weighted modular inequalities. We also extend this extrapolation technique to the context of A1 weights. We apply the obtained results to the dyadic square function. Fractional integrals, singular integral operators and their commutators with bounded mean oscillation functions are also considered. We present an extension of the classical results of Boyd and Lorentz-Shimogaki to a wider class of operators and also to weighted and vector-valued estimates. Finally, the same kind of ideas leads us to extrapolate within the context of an appropriate class of non A1 weights and this can be used to prove a conjecture proposed by E. Sawyer.