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This work is a thorough and detailed study on the geometry of the unit sphere of certain Banach spaces of homogeneous polynomials in ${\mathbb{R}}^2$. Specifically, we provide a complete description of the unit spheres, identify the extreme…

We investigate the use of orthonormal polynomials over the unit disk B_2 in R^2 and the unit ball B_3 in R^3. An efficient evaluation of an orthonormal polynomial basis is given, and it is used in evaluating general polynomials over B_2 and…

Numerical Analysis · Mathematics 2013-08-09 Kendall Atkinson , Olaf Hansen , David Chien

In this paper we construct a properly embedded holomorphic disc in the unit ball $\mathbb{B}^2$ of $\mathbb{C}^2$ having a surprising combination of properties: on the one hand, it has finite area and hence is the zero set of a bounded…

Complex Variables · Mathematics 2019-10-15 Franc Forstneric

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 polynomials with no zeros on the unit ball in complex Euclidean space with a view toward characterizing when a rational function is bounded on the ball. We give a complete local description of such polynomials in two variables near…

Complex Variables · Mathematics 2026-02-25 Greg Knese , James Eldred Pascoe , Alan Sola

It is a classical theorem that if a function is integrable along the boundary of the unit circle, then the function is the nontangential limit of a holomorphic function on the open disc if and only if its Fourier coefficients for…

Complex Variables · Mathematics 2022-12-20 William E. Gryc

A new technique for proving fixed point theorems for families of holomorphic transformations of operator balls is developed. One of these theorems is used to show that a bounded representation in a real or complex Hilbert space is…

Metric Geometry · Mathematics 2011-09-02 M. I. Ostrovskii , V. S. Shulman , L. Turowska

We investigate several boundedness properties of function spaces considered as uniform spaces.

General Topology · Mathematics 2018-02-19 Lubica Hola , Ljubisa D. R. Kocinac

In this paper we extend the dichotomy given by Samuelsson and Wold that can be thought of as an analogue of the Wermer maximality theorem in $\mathbb{C}^2$ for certain polynomial polyhedra. We consider complex non-degenerate simply…

Complex Variables · Mathematics 2025-03-04 Sushil Gorai , Golam Mostafa Mondal

In this note, we prove a rigidity result for proper holomorphic maps between unit balls that have many symmetries and which extend to $\mathcal{C}^2$-smooth maps on the boundary.

Complex Variables · Mathematics 2023-05-31 Edgar Gevorgyan , Haoran Wang , Andrew Zimmer

In this paper, we study the unitarizations in the spaces of holomorphic sections of equivariant holomorphic line bundles over a bounded homogeneous domain under the action of a connected algebraic group acting transitively on the domain. We…

Representation Theory · Mathematics 2024-09-02 K. Arashi

In this paper we introduce a new approach to the concept of multipolynomials and generalize several results of the homogeneous polynomials and symmetric multilinear applications. We also present an abstract approach to the concept of…

Functional Analysis · Mathematics 2018-11-19 Joilson Ribeiro , Fabrício Santos

We study the boundedness problem for maximal operators in 3-dimensional Euclidean space associated to hypersurfaces given as the graph of $c+f$, where $f$ is a mixed homogeneous function which is smooth away from the origin and $c$ is a…

Classical Analysis and ODEs · Mathematics 2007-05-23 I. A. Ikromov , M. Kempe , D. Mueller

We prove several results on homogeneous plurisubharmonic polynomials on $\mathbb{C}^n$, $n\in\mathbb{Z}_{\geq 2}$. Said results are relevant to the problem of constructing local bumpings at boundary points of pseudoconvex domains of finite…

Complex Variables · Mathematics 2021-03-15 Lars Simon

In this paper we show that the moduli space of nodal cubic surfaces is isomorphic to a quotient of a 4-dimensional complex ball by an arithmetic subgroup of the unitary group. This complex ball uniformization uses the periods of certain K3…

Algebraic Geometry · Mathematics 2007-05-23 I. Dolgachev , B. van Geemen , S. Kondo

This paper presents a new version of boundary on coarse spaces. The space of ends functor maps coarse metric spaces to uniform topological spaces and coarse maps to uniformly continuous maps.

Metric Geometry · Mathematics 2019-07-08 Elisa Hartmann

We investigate the sets of uniform limits $A(\bar{B}_n)$, $A(\bar{D}^I)$ of polynomials on the closed unit ball $\bar{B}_n$ of $\mathbb{C}^n$ and on the cartesian product $\bar{D}^I$ where $I$ is an arbitrary set and $\bar{D}$ is the closed…

Complex Variables · Mathematics 2013-04-22 K. Makridis , V. Nestoridis

In this paper, we introduce new spaces of holomorphic functions on the unit ball $\mathbb{B}_{n}$ of $\mathbb{C}^{n}$ generalizing the classical Bergman spaces. The main results include the properties of some operators and integrals…

Complex Variables · Mathematics 2024-04-23 Hajer Ben Amor , Noureddine Ghiloufi

In this paper, the authors mainly discuss the images of spaces with an uniform base at non-isolated points, and obtain the following main results: (1)\ Perfect maps preserve spaces with an uniform base at non-isolated points; (2)\ Open and…

General Topology · Mathematics 2011-06-22 Fucai Lin , Shou Lin

Given any $\varepsilon>0$, we construct an orthonormal system of $n_k$ uniformly bounded polynomials of degree at most $k$ on the unit sphere in $\mathbb R^{m+1}$ where $n_k$ is bigger than $1-\varepsilon$ times the dimension of the space…

Complex Variables · Mathematics 2015-09-22 Jordi Marzo , Joaquim Ortega-Cerdà
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