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In this paper, we study the inversion formula for recovering a function from its windowed Fourier transform. We give a rigorous proof for an inversion formula which is known in engineering. We show that the integral involved in the formula…

泛函分析 · 数学 2011-09-21 Wenchang Sun

We explore the Bohr inequality involving the Fourier transforms of complex valued integrable and square integrable functions defined on a second countable compact topological group. We also investigate the connection of the Bohr phenomenon…

泛函分析 · 数学 2020-11-26 Bappaditya Bhowmik , Nilanjan Das

The Pinsker inequality lower bounds the Kullback--Leibler divergence $D_{\textrm{KL}}$ in terms of total variation and provides a canonical way to convert $D_{\textrm{KL}}$ control into $\lVert \cdot \rVert_1$-control. Motivated by…

信息论 · 计算机科学 2026-02-06 Guglielmo Beretta , Tommaso Cesari , Roberto Colomboni

In this work we show how to get advantage from the Riemann--Hilbert analysis in order to obtain first and second order differential equations for the orthogonal polynomials and associated functions with a weight on the unit circle. We…

经典分析与常微分方程 · 数学 2025-08-05 Amílcar Branquinho , Ana Foulquié-Moreno , Karina Rampazzi

We find an integral representation for the generalized hypergeometric function unifying known representations via generalized Stieltjes, Laplace and cosine Fourier transforms. Using positivity conditions for the weight in this…

经典分析与常微分方程 · 数学 2014-09-11 Dmitrii Karp

The $(k,a)$-generalised Fourier transform is the unitary operator defined using the $a$-deformed Dunkl harmonic oscillator.The main aim of this paper is to prove $L^p$-$L^q$ boundedness of $(k, a)$-generalised Fourier multipliers. To show…

泛函分析 · 数学 2021-10-22 Vishvesh Kumar , Michael Ruzhansky

For a family of weight functions that include the general Jacobi weight functions as special cases, exact condition for the convergence of the Fourier orthogonal series in the weighted $L^p$ space is given. The result is then used to…

数值分析 · 数学 2025-10-20 P. Vertesi , Yuan Xu

The generalization, similarly to exponential multivariate bases in the Fourier transform, of the Bessel functions to many dimensions is offered. Analogously to the Fourier transform property under the differentiation, the similar Hankel…

经典分析与常微分方程 · 数学 2024-10-21 Victor G. Zakharov

We establish a general class of entropy inequalities that take the concise form of Gaussian comparisons. The main result unifies many classical and recent results, including the Shannon-Stam inequality, the Brunn-Minkowski inequality, the…

信息论 · 计算机科学 2022-06-29 Efe Aras , Thomas A. Courtade

A weight-dependent generalization of the binomial theorem for noncommuting variables is presented. This result extends the well-known binomial theorem for q-commuting variables by a generic weight function depending on two integers. For a…

量子代数 · 数学 2012-03-19 Michael J. Schlosser

In this paper, we offer a proof for a family of functional inequalities interpolating between the Poincar{\'e} and the logarithmic Sobolev (standard and weighted) inequalities. The proofs rely both on entropy flows and on a CD($\rho$, n)…

泛函分析 · 数学 2019-03-04 Ivan Gentil , Simon Zugmeyer

Sharp $L^p$ extensions of Pitt's inequality expressed as a weighted Sobolev inequality are obtained using convolution estimates and Stein-Weiss potentials. More generally, optimal constants are obtained for the full Stein-Weiss potential as…

偏微分方程分析 · 数学 2007-05-23 William Beckner

A proof of Poincar\'e-Birkhoff-Witt theorem is given for a class of generalized Lie algebras closely related to the Gurevich S-Lie algebras. As concrete examples, we construct the positive (negative) parts of the quantized universal…

q-alg · 数学 2009-10-30 Cesar Bautista

We introduce a deformation of the Fourier transform on $\mathbb{R}^N$ arising from a representation-theoretic construction associated with $\widetilde{SL}(2,\mathbb{R}) \times O(N)$ that still admits an underlying degree-one operator…

表示论 · 数学 2026-04-08 Temma Aoyama

This work explores new deep connections between John-Nirenberg type inequalities and Muckenhoupt weight invariance for a large class of $BMO$-type spaces. The results are formulated in a very general framework in which $BMO$ spaces are…

泛函分析 · 数学 2017-07-06 Jarod Hart , Rodolfo H. Torres

We prove an inversion theorem for the Fourier transform defined for normal functions, in the case when such functions are of moderate decrease, and in dimensions 2 and 3. This improves on Carleson's general almost everywhere convergence…

数学物理 · 物理学 2024-04-01 Tristram de Piro

In this article several types of inequalities for weighted sums of the moduli of Taylor coefficients for Bloch functions are proved

复变函数 · 数学 2019-04-25 I. R. Kayumov , K. -J. Wirths

We present some results concerning the $l^p$ norms of weighted mean matrices. These results can be regarded as analogues to a result of Bennett concerning weighted Carleman's inequalities.

泛函分析 · 数学 2008-08-26 Peng Gao

Weighted fractional Poincar\'e-type inequalities are proved on John domains whenever the weights defined on the domain are depending on the distance to the boundary and to an arbitrary compact set in the boundary of the domain.

泛函分析 · 数学 2017-12-25 Ritva Hurri-Syrjänen , Fernando López-García

In this article, using generalized derivations, we obtain a simple idea to prove the non-commutative Newton binomial formula in unital algebras and then, we extend that formula to non-unital algebras. Additionally, we establish the…

泛函分析 · 数学 2019-03-01 A. Hosseini , M. Mohammadzadeh Karizaki