Rubio de Francia's extrapolation theory: estimates for the distribution function

Details Rubio de Francia's extrapolation theory: estimates for the distribution function Rubio de Francia's extrapolation theory: estimates for the distribution function

2010-11-09

arxiv.org/abs/1011.2032v1

Mathematics

Classical Analysis and ODEs

29 pages

Scientific paper

Let $T$ be an arbitrary operator bounded from $L^{p_0}(w)$ into $L^{p_0, \infty}(w)$ for every weight $w$ in the Muckenhoupt class $A_{p_0}$. It is proved in this article that the distribution function of $Tf$ with respect to any weight $u$ can be essentially majorized by the distribution function of $Mf$ with respect to $u$ (plus an integral term easy to control). As a consequence, well-known extrapolation results, including results in a multilinear setting, can be obtained with very simple proofs. New applications in extrapolation for two-weight problems and estimates on rearrangement invariant spaces are established too.

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