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We show that harmonic spinors obey a strengthened version of the well-known pointwise Kato inequality for sections of a vector bundle with a connection. We then prove a decay estimate for eigenspinors using this Kato-Yau estimate and…

Differential Geometry · Mathematics 2016-04-08 Paul M. N. Feehan

We present inequalities and some applications to Kellers' limit and Carlemans' inequality.

Classical Analysis and ODEs · Mathematics 2013-12-24 Cristinel Mortici , Hu Yue

We revisit entropy methods to prove new sharp trace logarithmic Sobolev and sharp Gagliardo-Nirenberg-Sobolev inequalities on the half space, with a focus on the entropy inequality itself and not the actual flow, allowing for somewhat…

Analysis of PDEs · Mathematics 2021-12-28 Simon Zugmeyer

There are at least two directions concerning the extension of classical sharp Hardy-Littlewood-Sobolev inequality: (1) Extending the sharp inequality on general manifolds; (2) Extending it for the negative exponent $\lambda=n-\alpha$ (that…

Analysis of PDEs · Mathematics 2013-09-11 Jingbo Dou , Meijun Zhu

We give a partial negative answer to a question left open in a previous work by Brasco and the first and third-named authors concerning the sharp constant in the fractional Hardy inequality on convex sets. Our approach has a geometrical…

Analysis of PDEs · Mathematics 2025-09-30 Francesca Bianchi , Giorgio Stefani , Anna Chiara Zagati

The current status concerning Hardy-type inequalities with sharp constants is presented and described in a unified convexity way. In particular, it is then natural to replace the Lebesgue measure $dx$ with the Haar measure $dx/x.$ There are…

Classical Analysis and ODEs · Mathematics 2023-02-27 Lars-Erik Persson , Natasha Samko , George Tephnadze

We prove a Hardy inequality for ultraspherical expansions by using a proper ground state representation. From this result we deduce some uncertainty principles for this kind of expansions. Our result also implies a Hardy inequality on…

Classical Analysis and ODEs · Mathematics 2017-03-10 Alberto Arenas , Óscar Ciaurri , Edgar Labarga

We investigate connections between Hardy's inequality in the whole space $\mathbb{R}^n$ and embedding inequalities for Sobolev-Lorentz spaces. In particular, we complete previous results due to [A. Alvino, Sulla diseguaglianza di Sobolev in…

Functional Analysis · Mathematics 2017-11-13 Daniele Cassani , Bernhard Ruf , Cristina Tarsi

We present a unified strategy to derive Hardy-Poincar\'e inequalities on bounded and unbounded domains. The approach allows proving a general Hardy-Poincar\'e inequality from which the classical Poincar\'e and Hardy inequalities immediately…

Analysis of PDEs · Mathematics 2021-03-12 Giovanni Di Fratta , Alberto Fiorenza

We prove Hardy's inequality for the fractional powers of the generalized sublaplacian and the fractional powers of the Grushin operator. We also find an integral representation and a ground state representation for the fractional powers of…

Analysis of PDEs · Mathematics 2017-12-05 Rakesh Balhara

In this paper, we present a version of horizontal weighted Hardy-Rellich type and Caffarelli-Kohn-Nirenberg type inequalities on stratified groups and study some of their consequences. Our results reflect on many results previously known in…

Functional Analysis · Mathematics 2017-01-23 Michael Ruzhansky , Durvudkhan Suragan

We prove a fractional version of the Hardy--Sobolev--Maz'ya inequality for arbitrary domains and $L^p$ norms with $p\geq 2$. This inequality combines the fractional Sobolev and the fractional Hardy inequality into a single inequality, while…

Functional Analysis · Mathematics 2011-09-30 Bartłomiej Dyda , Rupert L. Frank

The main result includes features of a Hardy-type inequality and an inequality of either Sobolev or Gagliardo-Nirenberg type. It is inspired by the method of proof of a recent improved Sobolev inequality derived by M. Ledoux which brings…

Spectral Theory · Mathematics 2007-10-23 A. Balinsky , W. D. Evans , D. Hundertmark , R. T. Lewis

Korn's inequality has been at the heart of much exciting research since its first appearance in the beginning of the 20th century. Many are the applications of this inequality to the analysis and construction of discretizations of a large…

Analysis of PDEs · Mathematics 2025-08-26 Gonzalo A. Benavides , Sebastián A. Domínguez-Rivera

We give some estimates of the remainder terms for several conformally-invariant Sobolev-type inequalities on the Heisenberg group, in analogy with the Euclidean case. By considering the variation of associated functionals, we give a…

Analysis of PDEs · Mathematics 2016-01-20 Heping Liu , An Zhang

Motivated by a recent result on finite-dimensional Hilbert spaces, we prove a Jensen's inequality for partial traces in semifinite von Neumann algebras. We also prove a similar inequality in the framework of general (non-tracial) von…

Operator Algebras · Mathematics 2026-03-11 Mizanur Rahaman , Lyudmila Turowska

In this paper we have introduced arithmetic ff-continuity and arithmetic fb-continuity utilizing the concept of forward and backward arithmetic convergence in quasi cone metric spaces. These concepts are used to prove some fascinating…

Functional Analysis · Mathematics 2022-12-21 Shallu Sharma , Iqbal Kour

In this paper we study some improvements of the classical Hardy inequality. We add to the right hand side of the inequality a term which depends on some Lorentz norms of $u$ or of its gradient and we find the best values of the constants…

Analysis of PDEs · Mathematics 2010-02-17 Angelo Alvino , Roberta Volpicelli , Bruno Volzone

In this paper we consider a weighted version of one dimensional discrete Hardy's Inequality on half-line with power weights of the form $n^\alpha$. Namely we consider: \begin{equation} \sum_{n=1}^\infty |u(n)-u(n-1)|^2 n^\alpha \geq…

Functional Analysis · Mathematics 2022-05-20 Shubham Gupta

We study some Hardy-type inequalities involving a general norm in $R^n$ and an anisotropic distance function to the boundary. The case of the optimality of the constants is also addressed.

Analysis of PDEs · Mathematics 2015-12-18 Francesco Della Pietra , Giuseppina di Blasio , Nunzia Gavitone