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In this article, a novel method to compute all discrete polyharmonic functions in the quarter plane for models with small steps, zero drift and a finite group is proposed. A similar method is then introduced for continuous polyharmonic…

Combinatorics · Mathematics 2022-11-22 Andreas Nessmann

We study boundary properties of plurisubharmonic functions near real submanifolds of almost complex manifolds.

Complex Variables · Mathematics 2020-08-26 Alexandre Sukhov

We extend a recent result of Avelin, Hed, and Persson about approximation of functions $u$ that are plurisubharmonic on a domain $\Omega$ and continuous on $\bar\Omega$, with functions that are plurisubharmonic on (shrinking) neighborhoods…

Complex Variables · Mathematics 2016-09-16 Haakan Persson , Jan Wiegerinck

In this paper we introduce and study the notion of plurisubharmonic functions in calibrated geometry. These functions generalize the classical plurisubharmonic functions from complex geometry and enjoy many of their important properties.…

Complex Variables · Mathematics 2018-02-22 F. Reese Harvey , H. Blaine Lawson,

We show by an example that the Demailly approximation sequence of a plurisubharmonic function, constructed via Bergman kernels, is not a decreasing sequence in general.

Complex Variables · Mathematics 2014-01-22 Dano Kim

Some results on singularities of plurisubharmonic functions are put into the context of tropical mathematics.

Complex Variables · Mathematics 2010-01-14 Alexander Rashkovskii

Let $u$ be a maximal plurisubharmonic function in a domain $\Omega\subset\mathbb{C}^n$ ($n\geq 2$). It is classical that, for any $U\Subset\Omega$, there exists a sequence of bounded plurisubharmonic functions $PSH(U)\ni u_j\searrow u$…

Complex Variables · Mathematics 2018-04-11 Hoang-Son Do

We consider the pointwise approximation of a subharmonic function by the logarithm of the modulus of an entire function up to a bounded quantity. In the case of finite order an estimate from below of the planar Lebesgue measure of an…

Complex Variables · Mathematics 2010-01-08 Markiyan Hirnyk

In the present paper we establish sharp pointwise estimates on the polyharmonic Green function and its derivatives in an arbitrary bounded open set.

Analysis of PDEs · Mathematics 2009-03-06 Svitlana Mayboroda , Vladimir Maz'ya

In this note we study the plurifinely locally maximal plurifinely plurisubharmonic functions and improve some known results on these functions. We prove in particular that any locally bounded plurifinely locally maximal plurifinely…

Complex Variables · Mathematics 2017-11-06 Mohamed El Kadiri

We give an estimate for the volume of an analytic variety (or more generally the mass of a positive closed current) close to a real submanifold $M$. Applications are given to the Hausdorff measure of the intersection of the variety with $M$…

Complex Variables · Mathematics 2022-10-25 Bo Berndtsson

We obtain an analog of Shvedov theorem for convex multivariate approximation by algebras of continuous functions.

Metric Geometry · Mathematics 2010-11-16 Andriy Bondarenko , Andriy Prymak

It is known that a subharmonic function of finite order $\rho$ can be approximated by the logarithm of the modulus of an entire function at the point $z$ outside an exceptional set up to $C\log|z|$. In this article we prove that if such an…

Complex Variables · Mathematics 2007-10-03 Markiyan Hirnyk

We give a local characterization of the class of functions having positive distributional derivative with respect to $\bar{z}$ that are almost everywhere equal to one of finitely many analytic functions and satisfy some mild non-degeneracy…

Complex Variables · Mathematics 2009-09-29 Julius Borcea , Rikard Bøgvad

A variant of Siu's analyticity theorem is proved for relative types of plurisubharmonic functions. Some results on propagation of plurisubharmonic singularities and maximality of pluricomplex Green functions with analytic singularities are…

Complex Variables · Mathematics 2010-01-14 Alexander Rashkovskii

We give a short survey on plurisubharmonic interpolation, with focus on possibility of connecting two given plurisubharmonic functions by plurisubharmonic geodesic.

Complex Variables · Mathematics 2023-07-07 Alexander Rashkovskii

We prove the existence of entire functions that achieve universal approximations on certain countable sequences of translation operators .

Functional Analysis · Mathematics 2022-02-22 Nikos Tsirivas

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 prove several results showing that plurisubharmonic functions with various bounds on their Monge-Ampere masses on a bounded hyperconvex domain always admit global plurisubharmonic subextension with logarithmic growth at infinity.

Complex Variables · Mathematics 2007-05-23 U. Cegrell , S. Kolodziej , A. Zeriahi

The goal of this note is to show that continuous functions may be approximated using scattered translates of the Poisson kernel.

Functional Analysis · Mathematics 2025-09-15 Jeff Ledford