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The article introduces Ahlfors' generalization of the Schwarz lemma. With this powerful geometric tool of complex functions in one variable, we are able to prove some theorems concerning the size of images under holomorphic mappings,…

Complex Variables · Mathematics 2015-06-24 Aleksander Simonič

We show that if a meromorphic function has a direct singularity over infinity, then the escaping set has an unbounded component and the intersection of the escaping set with the Julia set contains continua. This intersection has an…

Complex Variables · Mathematics 2008-09-28 Walter Bergweiler , Philip J. Rippon , Gwyneth M. Stallard

In this paper, we study the class ${\Sigma^{(m)}(p)}$ of meromorphic univalent functions $f$ in $\mathbb{D}$ with a pole of order ${m \geq 1}$ at $p \in (0,1)$, admitting a $k$-quasiconformal extension ($0 \leq k < 1$) to…

Complex Variables · Mathematics 2025-11-13 Molla Basir Ahamed , Partha Pratim Roy

We study Picard's exceptional values of holomorphic one-parametric families of entire functions. Our first result shows that the set of parameter values for which zero is a Picard value can be an arbitrary closed set of zero logarithmic…

Complex Variables · Mathematics 2008-08-08 Alexandre Eremenko

In this paper, we prove a general second main theorem for meromorphic mappings into a subvariety $V$ of $\mathbb P^N(\mathbb C)$ with an arbitrary family of moving hypersurfaces. Our second main theorem generalizes and improves all previous…

Complex Variables · Mathematics 2022-06-01 Si Duc Quang

This article extends classical one variable results about Euler products defined by integral valued polynomial or analytic functions to several variables. We show there exists a meromorphic continuation up to a presumed natural boundary,…

Number Theory · Mathematics 2016-08-16 Gautami Bhowmik , Driss Essouabri , Ben Lichtin

This paper re-develops the Nevanlinna theory for meromorphic functions on $\mathbb C$ in the viewpoint of holomorphic forms. According to our observation, Nevanlinna's functions can be formulated by a holomorphic form. Applying this thought…

Complex Variables · Mathematics 2022-08-31 Xianjing Dong , Shuangshuang Yang

We define the class of Left Located Divisor (LLD) meromorphic functions and their vertical order $m_0(f)$ and their convergence exponent $d(f)$. When $m_0(f)\leq d(f)$ we prove that their Weierstrass genus is minimal. This explains the…

Complex Variables · Mathematics 2013-06-11 Vicente Muñoz , Ricardo Pérez Marco

Using the locally compact abelian group $\BT \times \BZ$, we assign a meromorphic function to each ideal triangulation of a 3-manifold with torus boundary components. The function is invariant under all 2--3 Pachner moves, and thus is a…

Geometric Topology · Mathematics 2018-10-18 Stavros Garoufalidis , Rinat Kashaev

By using Nevanlinna theory, we prove some normality criteria for a family of meromorphic functions under a condition on differential polynomials generated by the members of the family.

Complex Variables · Mathematics 2017-01-26 Gerd Dethloff , Tran Van Tan , Nguyen Van Thin

We introduce Omega functions that generalize Euler Gamma functions and study the functional difference equation they satisfy. Under a natural exponential growth condition, the vector space of meromorphic solutions of the functional equation…

Complex Variables · Mathematics 2025-06-18 Ricardo Perez-Marco

The purpose of this article is threefold. The first is to construct a Nevanlina theory for meromorphic mappings from a polydisc to a compact complex manifold. In particular, we give a simple proof of Lemma on logarithmic derivative for…

Complex Variables · Mathematics 2017-11-13 Do Duc Thai , Vu Duc Viet

In the paper a theorem of Piccard's type is proved and, consequently, the continuity of $\mathcal{D}$-measurable polynomial functions of $n$-th order as well as $\mathcal{D}$-measurable $n$-convex functions is shown. The paper refers to the…

General Topology · Mathematics 2015-06-23 Eliza Jablonska

The concept of proximate order is widely used in the theories of entire, meromorphic, subharmonic and plurisubharmonic functions. We give a general interpretation of this concept as a proximate growth function relative to a model growth…

Complex Variables · Mathematics 2019-12-03 Bulat N. Khabibullin

In this paper, using Nevanlinna's value distribution theory of meromorphic functions in several complex variables, we study for the existence of entire solutions $f$ in $\mathbb{C}^2$ of the following partial differential equation…

Complex Variables · Mathematics 2025-11-14 Junfeng Xu , Nabadwip Sarkar , Sujoy Majumder

Consider a_1,a_2,...,a_n, arbitrary elements of R. We characterize those real functions f that decompose into the sum of a_j-periodic functions, i.e., f=f_1+...+f_n with D_{a_j}f(x):=f(x+a_j)-f(x)=0. We show that f has such a decomposition…

Classical Analysis and ODEs · Mathematics 2007-05-25 Bálint Farkas , Viktor Harangi , Tamás Keleti , Szilárd Gy. Révész

In this paper, for a transcendental meromorphic function $f$ and $a\in \mathbb{C}$, we have exhaustively studied the nature and form of solutions of a new type of non-linear differential equation of the following form which has never been…

Complex Variables · Mathematics 2021-11-23 Tania Biswas , Sayantan Maity , Abhijit Banerjee

Let $V$ be a projective subvariety of $\mathbb P^n(\mathbb C)$. A family of hypersurfaces $\{Q_i\}_{i=1}^q$ in $\mathbb P^n(\mathbb C)$ is said to be in $N$-subgeneral position with respect to $V$ if for any $1\le i_1<\cdots <i_{N+1}$, $…

Complex Variables · Mathematics 2017-10-16 Si Duc Quang , Do Phuong An

Let U be the open unit disc in C. Given a continuous function g: bU --> C-{0} denote by W(g) the winding number of g around the origin. We prove that a continuous function f: bU --> C extends meromorphically through U if and only if there…

Complex Variables · Mathematics 2007-05-23 Josip Globevnik

Sitting at the top level of the Askey-scheme, Wilson polynomials are regarded as the most general hypergeometric orthogonal polynomials. Instead of a differential equation, they satisfy a second order Sturm-Liouville type difference…

Complex Variables · Mathematics 2017-03-03 Kam Hang Cheng , Yik-Man Chiang