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We review recent results on functional inequalities for systems of orthonormal functions. The key finding is that for various operators the orthonormality leads to a gain over a simple application of the triangle inequality. The operators…

Functional Analysis · Mathematics 2021-09-29 Rupert L. Frank

In this paper we establish mixed weak inequalities of Fefferman-Stein type for Calder\'on-Zygmund operators and their commutators, improving some previous results known in the literature. The main estimates also generalize the classical…

Classical Analysis and ODEs · Mathematics 2025-11-20 Rocío Ayala , Fabio Berra , Gladis Pradolini

Quantum harmonic analysis on phase space is shown to be linked with localization operators. The convolution between operators and the convolution between a function and an operator provide a conceptual framework for the theory of…

Functional Analysis · Mathematics 2017-10-17 Franz Luef , Eirik Skrettingland

We give a distribution-dependent concentration inequality for functions of independent variables. The result extends Bernstein's inequality from sums to more general functions, whose variation in any argument does not depend too much on the…

Probability · Mathematics 2017-05-12 Andreas Maurer

The Weinstein operator has several applications in pure and applied Mathematics especially in Fluid Mechanics and satisfies some uncertainty principles similar to the Euclidean Fourier transform. The aim of this paper is establish a…

Analysis of PDEs · Mathematics 2021-01-14 Ahmed Saoudi

We establish a weighted inequality for fractional maximal and convolution type operators, between weak Lebesgue spaces and Wiener amalgam type spaces on $ \mathbb R $ endowed with a measure which needs not to be doubling.

Classical Analysis and ODEs · Mathematics 2018-10-05 Aïssata Adama , Justin Feuto , Ibrahim Fofana

We formulate and discuss a conjecture which would extend a classical inequality of Bernstein.

Classical Analysis and ODEs · Mathematics 2010-03-08 Vilmos Komornik , Paola Loreti

Using P\'{o}lya's urn model with negative replacement we introduce a new Bernstein-type operator and we show that the new operator improves upon the known estimates for the classical Bernstein operator. We also provide numerical evidence…

Classical Analysis and ODEs · Mathematics 2017-10-25 Mihai N. Pascu , Nicolae R. Pascu , Florenţa Tripşa

We establish a new Bernstein-type deviation inequality for general (non-reversible) discrete-time Markov chains via an elementary approach. More robust than existing works in the literature, our result only requires the Markov chain to…

Probability · Mathematics 2025-10-07 De Huang , Xiangyuan Li

The main purpose of this paper is to study the validity of the Hausdorff-Young inequality for vector-valued functions defined on a non-commutative compact group. The natural context for this research is that of operator spaces. This leads…

Functional Analysis · Mathematics 2007-05-23 José García-Cuerva , Javier Parcet

In this paper, new sharpened Huygens type inequalities involving Bessel and modified Bessel functions of the first kinds are established

Classical Analysis and ODEs · Mathematics 2015-12-21 Khaled Mehrez

The purpose of this paper is twofold. The first aim is based on Riesz--Thorin's interpolation theorem, we prove new Hausdorff--Young type inequalities for the Quadratic Fourier transforms in (Ann. Funct. Anal. 2014;5(1):10--23) and linear…

Classical Analysis and ODEs · Mathematics 2024-08-29 Trinh Tuan , Lai Tien Minh

We are proving a Bernstein type inequality in the shift-invariant spaces of $L_2(R)$.

Functional Analysis · Mathematics 2017-08-29 V. Babenko , A. Ligun , S. Spektor

The classical form of Gr\"{u}ss' inequality was first published by G. Gr\"{u}ss in 1935 and gives an estimate of the difference between the integral of the product and the product of the integrals of two functions. After that many variants…

Classical Analysis and ODEs · Mathematics 2015-06-29 Heiner Gonska , Maria Rusu , Elena Dorina Stănilă

A Stein-Weiss type inequality on Carnot groups is established by proving the boundedness of an integral operator and the Hardy-Littlewood-Sobolev type inequality on Carnot groups is also derived.

Analysis of PDEs · Mathematics 2013-03-22 Tingxi Hu , Pengcheng Niu

In this paper, we present a refined version of the (classical) Stein inequality for the Fourier transform, elevating it to a new level of accuracy. Furthermore, we establish extended analogues of a more precise version of the Stein…

Functional Analysis · Mathematics 2024-11-19 Erlan D. Nursultanov , Durvudkhan Suragan

Derived from the results in [Giang et al.: \emph{Convolutions for the Fourier transforms with geometric variables and applications}, Math. Nachr. 283(12) (2010), 1758--1770], in this paper, we devoted to studying the boundedness properties…

Classical Analysis and ODEs · Mathematics 2025-08-12 Nguyen Thi Hong Phuong , Trinh Tuan , Lai Tien Minh

The present paper is about Bernstein-type estimates for Jacobi polynomials and their applications to various branches in mathematics. This is an old topic but we want to add a new wrinkle by establishing some intriguing connections with…

Classical Analysis and ODEs · Mathematics 2018-06-20 Tom Koornwinder , Aleksey Kostenko , Gerald Teschl

We generalize the Beckner's type Poincar\'e inequality \cite{Beckner} to a large class of probability measures on an abstract Wiener space of the form $\mu\star\nu$, where $\mu$ is the reference Gaussian measure and $\nu$ is a probability…

Probability · Mathematics 2014-09-23 Paolo Da Pelo , Alberto Lanconelli , Aurel I. Stan

The Fefferman-Stein type inequality for strong maximal operator is verified with compositions of some maximal operators in the heigher dimensions. An elementary proof of the endpoint estimate for the strong maximal operator is also given.

Classical Analysis and ODEs · Mathematics 2016-11-15 Hitoshi Tanaka