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We prove the Hardy-Littlewood-Sobolev type $L^p$ estimates for the gain term of the Boltzmann collision operator including Maxwellian molecule, hard potential and hard sphere models. Combining with the results of Alonso et al. [2] for the…

Analysis of PDEs · Mathematics 2024-10-25 Ling-Bing He , Jin-Cheng Jiang , Hung-Wen Kuo , Meng-Hao Liang

In this article, we first try to make the known analogy between convexity and plurisubharmonicity more precise. Then we introduce a notion of strict plurisubharmonicity analogous to strict convexity, and we show how this notion can be used…

Complex Variables · Mathematics 2023-09-08 Anne-Edgar Wilke

We establish the $L_p$-solvability for time fractional parabolic equations when coefficients are merely measurable in the time variable. In the spatial variables, the leading coefficients locally have small mean oscillations. Our results…

Analysis of PDEs · Mathematics 2019-01-03 Hongjie Dong , Doyoon Kim

We state and discuss several interrelated results, conjectures, and questions regarding contractive inequalities for classical $H^p$ spaces of the unit disc. We study both coefficient estimates in terms of weighted $\ell^2$ sums and the…

Functional Analysis · Mathematics 2018-12-05 Ole Fredrik Brevig , Joaquim Ortega-Cerdà , Kristian Seip , Jing Zhao

We provide a complete description of those Banach algebras that are generated by an invertible isometry of an $L^p$-space together with its inverse. Examples include the algebra $PF_p(\mathbb{Z})$ of $p$-pseudofunctions on $\mathbb{Z}$, the…

Functional Analysis · Mathematics 2016-08-30 Eusebio Gardella , Hannes Thiel

We study the Hausdorff distance between a set and its convex hull. Let $X$ be a Banach space, define the CHD-module of space $X$ as the supremum of this distance for all subset of the unit ball in $X$. In the case of finite dimensional…

Functional Analysis · Mathematics 2015-05-07 Grigory Ivanov

We prove the filling area conjecture in the hyperelliptic case. In particular, we establish the conjecture for all genus 1 fillings of the circle, extending P. Pu's result in genus 0. We translate the problem into a question about closed…

Differential Geometry · Mathematics 2007-05-23 Victor Bangert , Christopher Croke , Sergei V. Ivanov , Mikhail G. Katz

This paper is concerned with Schr\"odinger equations whose principal operators are homogeneous elliptic. When the corresponding level hypersurface is convex, we show the $L^p$-$L^q$ estimate of solution operator in free case. This estimate,…

Analysis of PDEs · Mathematics 2007-05-23 Quan Zheng , Xiaohua Yao , Da Fan

The Banach space $L^p(X,\mu)$, for $X$ a compact Hausdorff measure space, is considered as a special kind of quasi *-algebra (called CQ*-algebra) over the C*-algebra $C(X)$ of continuous functions on $X$. It is shown that, for $p \geq 2$,…

funct-an · Mathematics 2008-02-03 F. Bagarello , C. Trapani

Many of the known complemented subspaces of L_p have realizations as sequence spaces. In this paper a systematic approach to defining these spaces which uses partitions and weights is introduced. This approach gives a unified description of…

Functional Analysis · Mathematics 2007-05-23 Dale Alspach , Simei Tong

In this article, we study multivariate generalizations of the Matsaev's conjecture in commutative and non-commutative $L^p$-spaces.We prove that the multivariate analogue of Matsaev's conjecture is eventually false for all $1<p<\infty.$ We…

Functional Analysis · Mathematics 2020-12-14 Samya Kumar Ray

We introduce the notion of a regular mapping on a non-commutative $L_p$-space associated to a hyperfinite von Neumann algebra for $1\le p\le \infty$. This is a non-commutative generalization of the notion of regular or order bounded map on…

Functional Analysis · Mathematics 2016-09-06 Gilles Pisier

For any $p\in[1,\infty)$, we prove that the set of simple functions taking at most $k$ different values is proximinal in B\"ochner spaces $L^p(X)$ whenever $X$ is a dual Banach space with $w^*$-sequentially compact unit ball. With…

Functional Analysis · Mathematics 2024-04-24 Guillaume Grelier , Jaime San Martín

We introduce vector space norms associated to the Mahler measure by using the L^p norm versions of the Weil height recently introduced by Allcock and Vaaler. In order to do this, we determine orthogonal decompositions of the space of…

Number Theory · Mathematics 2009-11-11 Paul Fili , Zachary Miner

We prove the Invariant Subspace Conjecture for separable Hilbert spaces.

Functional Analysis · Mathematics 2023-07-24 Charles W. Neville

We prove that, given any covering of any separable infinite-dimensional uniformly rotund and uniformly smooth Banach space $X$ by closed balls each of positive radius, some point exists in $X$ which belongs to infinitely many balls.

Functional Analysis · Mathematics 2012-12-13 Vladimir P. Fonf , Michael Levin , Clemente Zanco

In this paper we study strongly coupled elliptic systems in non-variational form involving fractional Laplace operators. We prove Liouville type theorems and, by mean of the blow-up method, we establish a priori bounds of positive solutions…

Analysis of PDEs · Mathematics 2016-01-26 Edir Junior Ferreira Leite , Marcos Montenegro

In this paper, we prove the propagation of $L^p$ upper bounds for the spatially homogeneous relativistic Boltzmann equation for any $1<p<\infty$. We consider the case of relativistic \textit{hard ball} with Grad's angular cutoff. Our proof…

Analysis of PDEs · Mathematics 2020-02-03 Jin Woo Jang , Seok-Bae Yun

\begin{abstract} In this paper, we partly solve the generalized Khavinson conjecture in the setting of hyperbolic harmonic mappings in Hardy space. Assume that $u=\mathcal{P}_{\Omega}[\phi]$ and $\phi\in L^{p}(\partial\Omega, \mathbb{R})$,…

Analysis of PDEs · Mathematics 2023-05-24 Jiaolong Chen , David Kalaj , Petar Melentijević

Let $0<p<q\leq\infty$ and $\alpha \in (0,\infty]$. We give a characterization of quasi-Banach interpolation spaces for the couple $(L_p(0,\alpha),L_q(0,\alpha))$ in terms of two monotonicity properties, extending known results which mainly…

Functional Analysis · Mathematics 2020-02-21 Léonard Cadilhac