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Consider the group ${\mathbb{R}}^2$ with the discrete topology, and denote its Fourier algebra by $A({{\mathbb{R}}_{\rm d}^2})$. We reformulate a theorem of V.A. Yudin as a statement about restrictions of functions in $A({{\mathbb{R}}_{\rm…

Classical Analysis and ODEs · Mathematics 2014-07-14 John J. F. Fournier

We consider Guth's approach to the Fourier restriction problem via polynomial partitioning. By writing out his induction argument as a recursive algorithm and introducing new geometric information, known as the polynomial Wolff axioms, we…

Classical Analysis and ODEs · Mathematics 2019-09-26 Jonathan Hickman , Keith M. Rogers

We introduce the concepts of the Fourier transform and convolution generated by an arbitrary restriction of the differentiation operator in the space $L_{2}(0,b).$ In contrast to the classical convolution, the introduced convolution…

Analysis of PDEs · Mathematics 2013-02-07 Baltabek Kanguzhin , Niyaz Tokmagambetov

In this article, we define the Fourier-Dunkl transform, which generalizes the Fourier transform. We prove Strichartz's restriction theorem for the Fourier-Dunkl transform for a cone-hyper-surface and its generalisation to the family of…

Classical Analysis and ODEs · Mathematics 2022-12-08 P Jitendra Kumar Senapati , Pradeep Boggarapu , Shyam Swarup Mondal , Hatem Mejjaoli

We prove a uniform generalized gaussian bound for the powers of a discrete convolution operator in one space dimension. Our bound is derived under the assumption that the Fourier transform of the coefficients of the convolution operator is…

Numerical Analysis · Mathematics 2021-11-23 Jean-François Coulombel , Grégory Faye

We generalize the theorems of Stein--Tomas and Strichartz about surface restrictions of Fourier transforms to systems of orthonormal functions with an optimal dependence on the number of functions. We deduce the corresponding Strichartz…

Mathematical Physics · Physics 2014-05-28 Rupert L. Frank , Julien Sabin

In this paper, we use the Approximation Formula for the Fourier transform of the solution set of lattice points on k-spheres and methods of Bourgain and Ionescu to refine the l^p(Z^d)-boundedness results for discrete k- spherical maximal…

Classical Analysis and ODEs · Mathematics 2015-09-16 Kevin Hughes

Using some resolution of singularities and oscillatory integral methods in conjunction with appropriate damping and interpolation techniques, L^p boundedness theorems for p > 2 are obtained for maximal operators over a wide range of…

Classical Analysis and ODEs · Mathematics 2010-02-07 Michael Greenblatt

In this paper, we investigate $L^p$ bounds of maximal Fourier multiplier operators with dilation of fractional dimensions. For Fourier multipliers, we suggest a criterion related to dimensions of dilation sets which guarantees $L^p$ bounds…

Classical Analysis and ODEs · Mathematics 2025-11-04 Jin Bong Lee , Jinsol Seo

We prove sparse bounds for the spherical maximal operator of Magyar, Stein and Wainger. The bounds are conjecturally sharp, and contain an endpoint estimate. The new method of proof is inspired by ones by Bourgain and Ionescu, is very…

Classical Analysis and ODEs · Mathematics 2019-11-13 Robert Kesler , Michael T. Lacey , Darío Mena

We construct a function that lies in $L^p(\mathbb{R}^d)$ for every $p \in (1,\infty]$ and whose Fourier transform has no Lebesgue points in a Cantor set of full Hausdorff dimension. We apply Kova\v{c}'s maximal restriction principle to show…

Classical Analysis and ODEs · Mathematics 2020-01-29 Constantin Bilz

We deal with the restriction phenomenon for the Fourier transform. We prove that each of the restriction conjectures for the sphere, the paraboloid, the elliptic hyperboloid in $\mathbb{R}^n$ implies that for the cone in $\mathbb{R}^{n+1}$.…

Classical Analysis and ODEs · Mathematics 2008-04-24 Fabio Nicola

Bourgain in his seminal paper [2] about the analysis of maximal functions associated to convex bodies, has estimated in a sharp way the $L^2$-operator norm of the maximal function associated to a kernel $K\in L^1,$ with differentiable…

Functional Analysis · Mathematics 2024-01-23 Duván Cardona

In this paper, we initiate the study of the Fourier restriction phenomena on quantum Euclidean spaces, and establish the analogues of the Tomas-Stein restriction theorem and the two-dimensional full restriction theorem.

Functional Analysis · Mathematics 2022-09-07 Guixiang Hong , Xudong Lai , Liang Wang

For $0<\alpha<1$ let $V(\alpha)$ denote the supremum of the numbers $v$ such that every $\alpha$-H\"older continuous function is of bounded variation on a set of Hausdorff dimension $v$. Kahane and Katznelson (2009) proved the estimate $1/2…

Probability · Mathematics 2016-11-29 Omer Angel , Richárd Balka , András Máthé , Yuval Peres

We show that maximal operators formed by dilations of Mikhlin-H"ormander multipliers are typically not bounded on $L^p(R^d)$. We also give rather weak conditions in terms of the decay of such multipliers under which $L^p$ boundedness of the…

Classical Analysis and ODEs · Mathematics 2010-03-15 Michael Christ , Loukas Grafakos , Petr Honzik , Andreas Seeger

Let $S \subset \Bbb R^n$ be a smooth compact hypersurface with a strictly positive second fundamental form, $E$ be the Fourier extension operator on $S$, and $X$ be a Lebesgue measurable subset of $\Bbb R^n$. If $X$ contains a ball of each…

Classical Analysis and ODEs · Mathematics 2023-06-22 Bassam Shayya

In this paper, we prove restriction theorems for the Fourier-Laguerre transform and establish Strichartz estimates for the Schr\"{o}dinger propagator $e^{-itL_\alpha}$ for the Laguerre operator…

Functional Analysis · Mathematics 2022-05-24 Guoxia Feng , Manli Song

In this article, we study the problem of obtaining Lebesgue space inequalities for the Fourier restriction operator associated to rectangular pieces of the paraboloid and perturbations thereof. We state a conjecture for the dependence of…

Classical Analysis and ODEs · Mathematics 2019-11-27 Jeremy Schwend , Betsy Stovall

We prove a Fourier restriction estimate under the assumption that certain convolution power of the measure admits an $r$-integrable density.

Classical Analysis and ODEs · Mathematics 2014-04-15 Xianghong Chen