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In the present paper we introduce the notion of harmonicity modulus and harmonicity K-functional and apply these notions to prove a Jackson type theorem for approximation of continuous functions by polyharmonic functions. For corresponding…

Numerical Analysis · Mathematics 2010-05-28 Ognyan Kounchev

We study absolute continuity of harmonic measure with respect to surface measure on domains $\Omega$ that have large complements. We show that if $\Gamma\subset \mathbb{R}^{d+1}$ is $d$-Ahlfors regular and splits $ \mathbb{R}^{d+1}$ into…

Classical Analysis and ODEs · Mathematics 2016-08-29 Murat Akman , Jonas Azzam , Mihalis Mourgoglou

Via Gauge theory, we give a new proof of partial regularity for harmonic maps in dimension m>2 into arbitrary targets. This proof avoids the use of adapted frames and permits to consider targets of "minimal" C^2 regularity. The proof we…

Analysis of PDEs · Mathematics 2007-05-23 Tristan Riviere , Michael Struwe

Score matching is an estimation procedure that has been developed for statistical models whose probability density function is known up to proportionality but whose normalizing constant is intractable, so that maximum likelihood is…

Methodology · Statistics 2024-04-23 Jiazhen Xu , Janice L. Scealy , Andrew T. A. Wood , Tao Zou

We give several new characterizations of Caratheodory convergence of simply connected domains. We then investigate how different definitions of convergence generalize to the multiply-connected case.

Complex Variables · Mathematics 2018-05-24 Ilia Binder , Cristobal Rojas , Michael Yampolsky

A new representation of the Einstein evolution equations is presented that is first order, linearly degenerate, and symmetric hyperbolic. This new system uses the generalized harmonic method to specify the coordinates, and exponentially…

General Relativity and Quantum Cosmology · Physics 2011-04-21 Lee Lindblom , Mark A. Scheel , Lawrence E. Kidder , Robert Owen , Oliver Rinne

We prove the stronger version of Harnack's inequality for positive harmonic functions defined on the unit disc.

Complex Variables · Mathematics 2025-01-20 Marek Svetlik

We unite two themes in dyadic analysis and number theory by studying an analogue of the failure of the Hasse principle in harmonic analysis. Explicitly, we construct an explicit family of measures on the real line that are $p$-adic and…

Classical Analysis and ODEs · Mathematics 2023-09-22 Theresa C. Anderson , Bingyang Hu

We prove the intrinsic Harnack's inequality for a general form of a parabolic equation that generalizes both the standard parabolic $p$-Laplace equation and the normalized version arising from stochastic game theory. We prove each result…

Analysis of PDEs · Mathematics 2025-06-23 Tapio Kurkinen , Jarkko Siltakoski

In this article we first establish the maximum principle of the antisymmetric functions for parabolic fractional $p$-equations. Then we use it and the parabolic inequalities to provide a different proof of symmetry and monotonicity for…

Analysis of PDEs · Mathematics 2025-02-25 Pengyan Wang

General estimates from below of holomorphic and subharmonic functions play one of the key roles in the theory of growth of holomorphic and subharmonic functions and in general in the theory of potential. At the same time, the most diverse…

Complex Variables · Mathematics 2022-12-21 B. N. Khabibullin

In the harmonic description of general relativity, the principle part of Einstein equations reduces to a constrained system of 10 curved space wave equations for the components of the space-time metric. We use the pseudo-differential theory…

General Relativity and Quantum Cosmology · Physics 2011-04-21 H. -O. Kreiss , J. Winicour

We consider the Dirac equation with a generalized uncertainty principle in the presence of the Harmonic interaction and an external magnetic field. By doing the study in the momentum space, the problem solved in an exact analytical manner…

Quantum Physics · Physics 2014-01-23 Hassan Hassanabadi , Saber Zarrinkamar , Elham Maghsoodi

We provide a fractional counterpart of the classical results by Schwarz and Malmheden on harmonic functions. From that we obtain a representation formula for $s$-harmonic functions as a linear superposition of weighted classical harmonic…

Analysis of PDEs · Mathematics 2022-03-15 Serena Dipierro , Giovanni Giacomin , Enrico Valdinoci

Building on the first two authors' previous results, we prove a general criterion for convergence of (possibly singular) Bergman measures towards equilibrium measures on complex manifolds. The criterion may be formulated in terms of growth…

Complex Variables · Mathematics 2009-07-17 Robert J. Berman , Sebastien Boucksom , David Witt Nystrom

We develop a quantitative theory of stochastic homogenization in the more general framework of differential forms. Inspired by recent progress in the uniformly elliptic setting, the analysis relies on the study of certain subadditive…

Analysis of PDEs · Mathematics 2020-12-29 Paul Dario

An infinite dimensional algebra, which is useful for deriving exact solutions of the generalized pairing problem, is introduced. A formalism for diagonalizing the corresponding Hamiltonian is also proposed. The theory is illustrated with…

Quantum Physics · Physics 2008-02-03 Feng Pan , J. P. Draayer

General relativity and quantum mechanism are two separate rules of modern physics explaining how nature works. Both theories are accurate, but the direct connection between two theories was not yet clarified. Recently, researchers blur the…

General Relativity and Quantum Cosmology · Physics 2017-10-11 Gang Ren , Yi-Shi Duan

In 1984, a simple and useful univalence criterion for harmonic functions was given by Clunie and Sheil-Small, which is usually called the shear construction. However, the application of this theorem is limited to the planar harmonic…

Complex Variables · Mathematics 2014-09-29 Małgorzata Michalska , Andrzej Michalski

Chirikov's celebrated criterion of resonance overlap has been widely used in celestial mechanics and Hamiltonian dynamics to detect global instability, but is rarely rigourous. We introduce two simple Hamiltonian systems, each depending on…

Dynamical Systems · Mathematics 2023-08-30 Jacques Fejoz , Marcel Guardia