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The aim of this text is to extend the theory of generalized ordinary differential equations to the setting of metric spaces. We present existence and uniqueness theorems that significantly improve previous results even when restricted back…

Classical Analysis and ODEs · Mathematics 2018-02-12 Břetislav Skovajsa

We extend classical results of Rado on partition regularity of systems of linear equations with integer coefficients to the case when the coefficient ring is either an arbitrary integral domain or a noetherian ring. In particular, we show…

Combinatorics · Mathematics 2021-03-08 Jakub Byszewski , Elżbieta Krawczyk

We extend Elitzur's theorem to systems with symmetries intermediate between global and local. In general, our theorem formalizes the idea of {\it dimensional reduction}. We apply the results of this generalization to many systems that are…

Statistical Mechanics · Physics 2009-11-10 Cristian D. Batista , Zohar Nussinov

A description of solutions of some integral equations has been obtained. A two-radii theorem is obtained as well.

Classical Analysis and ODEs · Mathematics 2013-09-17 Olga D. Trofimenko

Given a compact of ${\bf R}^n$, there is always a doubling measure having it as its support. We use this fact to construct an integral operator that extends differentiable functions defined on any compact set of ${\bf R}^n$ to the whole of…

Classical Analysis and ODEs · Mathematics 2007-05-23 Jaume Gudayol

A basic measure of the combinatorial complexity of a convexity space is its Radon number. In this paper we show a fractional Helly theorem for convexity spaces with a bounded Radon number, answering a question of Kalai. As a consequence we…

Combinatorics · Mathematics 2019-03-05 Andreas F. Holmsen , Dong-Gyu Lee

We prove a uniformization theorem in complex algebraic geometry.

Algebraic Geometry · Mathematics 2010-08-11 Robert Treger

We establish the most general Szasz type estimates for homogeneous Besov and Lizorkin-Triebel spaces, and their realizations.

Functional Analysis · Mathematics 2021-05-06 Gérard Bourdaud

Rado's Theorem characterizes the systems of homogenous linear equations having the property that for any finite partition of the positive integers one cell contains a solution to these equations. Furstenberg and Weiss proved that solutions…

Dynamical Systems · Mathematics 2008-09-16 Mathias Beiglböck , Vitaly Bergelson , Tomasz Downarowicz , Alexander Fish

In this paper, we prove a generalization of Rado's Theorem, a fundamental result of minimal surface theory, which says that minimal surfaces over a convex domain with graphical boundaries must be disks which are themselves graphical. We…

Differential Geometry · Mathematics 2007-05-23 Brian Dean , Giuseppe Tinaglia

In this work, we extend K. Kodaira's embedding theorem to non compact hermitian complex manifolds and laminations by complex manifolds.

Complex Variables · Mathematics 2011-12-30 Bertrand Deroin

We characterize (up to endpoints) the $k$-tuples $(p_1,\ldots,p_k)$ for which certain $k$-linear generalized Radon transforms map $L^{p_1} \times \cdots \times L^{p_k}$ boundedly into $\mathbb R$. This generalizes a result of Tao and…

Classical Analysis and ODEs · Mathematics 2017-10-24 Betsy Stovall

We developpe a direct sum decomposition for n-dual spaces.

Functional Analysis · Mathematics 2007-05-23 Javier H. Guachalla

We prove a generalization of the Jordan canonical form theorem for a class of bounded linear operators on complex separable Hilbert spaces.

Functional Analysis · Mathematics 2011-09-21 Rui Shi

A general solution to the Complex Bateman equation in a space of arbitrary dimensions is constructed.

solv-int · Physics 2007-05-23 D. B. Fairlie , A. N. Leznov

We establish a twisted version of Skoda's estimate for the Koszul complex from which we get division theorems for the Koszul complex. This generalizes Skoda's division theorem. We also show how to use Skoda triples to produce division…

Complex Variables · Mathematics 2011-06-21 Qingchun Ji

In this paper we extend the Poletsky-Rosay theorem, concerning plurisubharmonicity of the Poisson envelope of an upper semicontinuous function, to locally irreducible complex spaces.

Complex Variables · Mathematics 2013-08-06 Barbara Drinovec Drnovsek , Franc Forstneric

We prove an extension theorem for Kahler currents with analytic singularities in a Kahler class on a complex submanifold of a compact Kahler manifold.

Complex Variables · Mathematics 2014-10-10 Tristan C. Collins , Valentino Tosatti

The $bmo$ space, also known as the local $BMO$ space, is the $BMO$ space which is uniformly locally $L^1$ in addition. In this article, we establish an extension theorem for the $bmo$ space defined in an arbitrary uniformly $C^2$ domain.…

Functional Analysis · Mathematics 2023-10-31 Zhongyang Gu

We prove some weighted $L_p$ estimates for generalized harmonic extensions in the half-space.

Classical Analysis and ODEs · Mathematics 2019-03-08 Roberta Musina , Alexander I. Nazarov