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We research the location of the zeros of the Eisenstein series and the modular functions from the Hecke type Faber polynomials associated with the normalizers of congruence subgroups which are of genus zero and of level at most twelve. In…

Number Theory · Mathematics 2008-03-25 Junichi Shigezumi

We investigate the zeros of two one-parameter families of harmonic functions and describe how the number of zeros depends on the parameter. Our functions have the property that all zeros lie on certain rays in the complex plane and thus we…

A brief proof of the statement that the zero-set of a nontrivial real-analytic function in $d$-dimensional space has zero measure is provided.

Classical Analysis and ODEs · Mathematics 2015-12-24 Boris Mityagin

We present some old and new results on a class of invariant spaces of holomorphic functions on symmetric domains, both in their circular bounded realizations and in their unbounded realizations as Siegel domains of type II. These spaces…

Complex Variables · Mathematics 2026-04-21 Mattia Calzi

Given a non-negative weight $v$, not necessarily bounded or strictly positive, defined on a domain $G$ in the complex plane, we consider the weighted space $H_v^\infty(G)$ of all holomorphic functions on $G$ such that the product $v|f|$ is…

Functional Analysis · Mathematics 2018-10-31 José Bonet , Dragan Vukotić

Necessary and sufficient geometric conditions are given for domains with regular boundary points and edges to be domains of holomorphy provided the remainder boundary subset is of zero Hausdorff 1-codimensional measure.

Complex Variables · Mathematics 2007-05-23 Dmitri Zaitsev , Giuseppe Zampieri

We extend the definition of weak and strong convergence to sequences of Sobolev-functions whose underlying domains themselves are converging. In contrast to previous works, we do so without ever assuming any sort of reference configuration.…

Analysis of PDEs · Mathematics 2024-11-20 Nikita Evseev , Malte Kampschulte , Alexander Menovschikov

There are several equivalent ways to define continuous harmonic functions $H(K)$ on a compact set $K$ in $\mathbb R^n$. One may let $H(K)$ be the unform closures of all functions in $C(K)$ which are restrictions of harmonic functions on a…

Classical Analysis and ODEs · Mathematics 2010-12-20 Tony L. Perkins

We give an explicit upper bound for the algebraic degree and an explicit lower bound for the absolute value of the minimum of a polynomial function on a compact connected component of a basic closed semialgebraic set when this minimum is…

Algebraic Geometry · Mathematics 2011-12-05 Gabriela Jeronimo , Daniel Perrucci , Elias Tsigaridas

We obtaine the full characterization of proper closed invariant subspaces of a generalized backward shift operator (Pommiez operator) in the Frechet space of all holomorphic functions on a simply connected domain $\Omega$ of the complex…

Functional Analysis · Mathematics 2021-08-23 Olga A. Ivanova , Sergej N. Melikhov , Yurii N. Melikhov

We study several quantities associated to the Green's function of a multiply connected domain in the complex plane. Among them are some intrinsic properties such as geodesics, curvature, and $L^2$-cohomology of the capacity metric and…

Complex Variables · Mathematics 2016-05-17 Diganta Borah , Pranav Haridas , Kaushal Verma

We study linear and algebraic structures in sets of bounded holomorphic functions on the ball which have large cluster sets at every possible point (i.e., every point on the sphere in several complex variables and every point of the closed…

Functional Analysis · Mathematics 2019-06-07 Thiago R. Alves , Daniel Carando

We study ($p$-harmonic) singular functions, defined by means of upper gradients, in bounded domains in metric measure spaces. It is shown that singular functions exist if and only if the complement of the domain has positive capacity, and…

Analysis of PDEs · Mathematics 2020-10-07 Anders Björn , Jana Björn , Juha Lehrbäck

We construct a function on the real line supported on a set of finite measure whose spectrum has density zero.

Classical Analysis and ODEs · Mathematics 2017-02-01 Fedor Nazarov , Alexander Olevskii

We give a simple and more elementary proof that the notions of Domain of Holomorphy and Weak Domain of Holomorphy are equivalent. This proof is based on a combination of Baire's Category Theorem and Montel's Theorem. We also obtain…

Complex Variables · Mathematics 2017-05-30 V. Nestoridis

Geometrically, zeroes of a Gaussian analytic function are intersection points of an analytic curve in a Hilbert space with a randomly chosen hyperplane. Mathematical physics provides another interpretation as a gas of interacting particles.…

Complex Variables · Mathematics 2007-05-23 Mikhail Sodin

We prove strong clustering of k-point correlation functions of zeroes of Gaussian Entire Functions. In the course of the proof, we also obtain universal local bounds for k-point functions of zeroes of arbitrary nondegenerate Gaussian…

Mathematical Physics · Physics 2016-12-21 Fedor Nazarov , Mikhail Sodin

In this paper we characterize the zero sets of functions from $\ell^{p}_{A}$ (the analytic functions on the open unit disk $D$ whose Taylor coefficients form an $\ell^p$ sequence) by developing a concept of an "inner function" modeled by…

Complex Variables · Mathematics 2018-07-30 Raymond Cheng , Javad Mashreghi , William T. Ross

We consider a class of weighted harmonic functions in the open upper half-plane known as $\alpha$-harmonic functions. Of particular interest is the uniqueness problem for such functions subject to a vanishing Dirichlet boundary value on the…

Analysis of PDEs · Mathematics 2025-01-03 Anders Olofsson , Jens Wittsten

We study entire functions whose zeros and one-points lie on distinct finite systems of rays. General restrictions on these rays are obtained. Non-trivial examples of entire functions with zeros and one-points on different rays are…

Complex Variables · Mathematics 2018-09-14 Walter Bergweiler , Alexandre Eremenko , Aimo Hinkkanen