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The Rubio de Francia extrapolation theorem is a very powerful result which states that in order to show that certain operators satisfy weighted norm inequalities with Muckenhoupt weights it suffices to see that the corresponding…

Analysis of PDEs · Mathematics 2023-08-30 José María Martell , Pierre Portal

This paper is devoted to studying the extrapolation theory of Rubio de Francia on general function spaces. We present endpoint extrapolation results including $A_1$, $A_p$, and $A_\infty$ extrapolation in the context of Banach function…

Classical Analysis and ODEs · Mathematics 2024-08-30 Mingming Cao , Andrea Olivo

Let $T$ be a linear operator that, for some $p_1\in(1,\infty)$, is bounded on $L^{p_1}(\tilde w)$ for all $\tilde w\in A_{p_1}(\mathbb R^d)$ and in addition compact on $L^{p_1}(w_1)$ for some $w_1\in A_{p_1}(\mathbb R^d)$. Then $T$ is…

Functional Analysis · Mathematics 2022-02-23 Tuomas Hytönen , Stefanos Lappas

This paper is devoted to studying the Rubio de Francia extrapolation for multilinear compact operators. It allows one to extrapolate the compactness of $T$ from just one space to the full range of weighted spaces, whenever an $m$-linear…

Classical Analysis and ODEs · Mathematics 2023-04-06 Mingming Cao , Andrea Olivo , Kôzô Yabuta

We generalize the extrapolation theory of Rubio de Francia to the context of Banach function spaces and modular spaces. Our results are formulated in terms of some natural weighted estimates for the Hardy-Littlewood maximal function and are…

Classical Analysis and ODEs · Mathematics 2021-01-18 Mingming Cao , Juan José Marín , José María Martell

In a previous paper by one of us, a "compact version" of Rubio de Francia's weighted extrapolation theorem was proved, which allows one to extrapolate the compactness of an operator from just one space to the full range of weighted spaces,…

Functional Analysis · Mathematics 2022-02-22 Tuomas Hytönen , Stefanos Lappas

In this paper, we prove a discrete Rubio de Francia extrapolation theorem via factorization of discrete Muckenhoupt weights and discrete iterated Rubio de Francia algorithm and its duality.

Functional Analysis · Mathematics 2023-04-28 S. H. Saker , A. I. Saied , R. P. Agarwal

In this article, we prove an analogue of the Rubio de Francia's extrapolation theorem in the setting of Hausdorff capacities. We prove the result using techniques analogous to those in the classical setting and using the recently developed…

Functional Analysis · Mathematics 2025-10-07 Aniruddha Deshmukh

In this paper we solve a long standing problem about the multivariable Rubio de Francia extrapolation theorem for the multilinear Muckenhoupt classes $A_{\vec{p}}$, which were extensively studied by Lerner et al. and which are the natural…

Classical Analysis and ODEs · Mathematics 2020-08-13 Kangwei Li , José María Martell , Sheldy Ombrosi

In this paper we present the results announced in the recent work by the first, second, and fourth authors of the current paper concerning Rubio de Francia extrapolation for the so-called multilinear Muckenhoupt classes. Here we consider…

Classical Analysis and ODEs · Mathematics 2020-08-13 Kangwei Li , José María Martell , Henri Martikainen , Sheldy Ombrosi , Emil Vuorinen

We extend the theory of Rubio de Francia extrapolation, including off-diagonal, limited range, and $A_{\infty}$ extrapolation, to the weighted variable Lebesgue spaces. As a consequence we are able to show that a number of different…

Classical Analysis and ODEs · Mathematics 2014-08-21 David Cruz-Uribe , Li-An Daniel Wang

In this paper we extend the theory of Rubio de Francia extrapolation for matrix weights, recently introduced by Bownik and the first author, to off-diagonal extrapolation. We also show that the theory of matrix weighted extrapolation can be…

Classical Analysis and ODEs · Mathematics 2025-04-18 David Cruz-Uribe , Fatih Şirin

In this paper, through the introduction of partial multiple weights, we firstly study the related Rubio de Francia extrapolation theorem within the framework of partial Muckenhoupt classes and further obtain the corresponding extrapolation…

Classical Analysis and ODEs · Mathematics 2025-05-28 Wang Dinghuai , Yin Huicheng

We prove Rubio de Francia extrapolation results in Lebesgue and grand Lebesgue spaces for quasi monotone functions with $QB_{\beta,p}$ weights. The extrapolation in Lebesgue spaces with the weight class $QB_{\beta,\infty}$ has also been…

Functional Analysis · Mathematics 2022-02-08 Arun Pal Singh , Ragul Panchal , Pankaj Jain , Monika Singh

We prove the discrete Rubio de Francia extrapolation theorem for a pair of quasi non-increasing sequences with $\mathcal{QB}_{\beta, p}$ weight class. Also, a weight characterization of the boundedness of the generalized discrete Hardy…

Functional Analysis · Mathematics 2026-03-09 Monika Singh , Amiran Gogatishvili , Rahul Panchal , Arun Pal Singh

We give an extension of Rubio de Francia's extrapolation theorem for functions taking values in UMD Banach function spaces to the multilinear limited range setting. In particular we show how boundedness of an $m$-(sub)linear operator…

Classical Analysis and ODEs · Mathematics 2024-05-31 Emiel Lorist , Zoe Nieraeth

The bidual of the closure of smooth functions with respect to the Morrey norm coincides with the Morrey space. This assertion is generalized to some Muckenhoupt weighted Morrey spaces. We combine this fact with basic extrapolation…

Functional Analysis · Mathematics 2016-07-18 Marcel Rosenthal , Hans-Juergen Schmeisser

In a previous paper, we obtained several "compact versions" of Rubio de Francia's weighted extrapolation theorem, which allowed us to extrapolate the compactness of linear operators from just one space to the full range of weighted Lebesgue…

Functional Analysis · Mathematics 2022-02-23 Tuomas Hytönen , Stefanos Lappas

In this paper we prove the Jones factorization theorem and the Rubio de Francia extrapolation theorem for matrix $\mathcal A_p$ weights. These results answer longstanding open questions in the study of matrix weights. The proof requires the…

Classical Analysis and ODEs · Mathematics 2025-10-21 Marcin Bownik , David Cruz-Uribe

We prove an extrapolation result for general operators under some weak assumptions on the boundedness of the operator. In particular, we show that if the operator is weakly bounded on some L^{p_{0}}(w), for all "flat" weights, w in…

Classical Analysis and ODEs · Mathematics 2012-04-19 Nicholas Boros , Nikolaos Pattakos , Alexander Volberg
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