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The dynamical classification of rational maps is a central concern of holomorphic dynamics. Much progress has been made, especially on the classification of polynomials and some approachable one-parameter families of rational maps; the goal…

Dynamical Systems · Mathematics 2022-01-10 Russell Lodge , Yauhen Mikulich , Dierk Schleicher

Thurston obtained a combinatorial characterization for generic branched self-coverings that preserve the orientation of the oriented 2-sphere by associating a planar graph to them [arXiv:1502.04760]. In this work, the Thurston result is…

Geometric Topology · Mathematics 2023-04-17 Arcelino Bruno Lobato do Nascimento

We show the resolution of indeterminacy of rational maps from a regular surface to a tame stack locally of finite type over an excellent scheme. The proof uses the valuative criterion for proper tame morphisms, which was proved by Bresciani…

Algebraic Geometry · Mathematics 2026-02-24 Myeong Jae Jeon

We give a simple algorithm that determines whether a given post-critically finite topological polynomial is Thurston equivalent to a polynomial. If it is, the algorithm produces the Hubbard tree; otherwise, the algorithm produces the…

Dynamical Systems · Mathematics 2021-11-25 James Belk , Justin Lanier , Dan Margalit , Rebecca R. Winarski

This note will describe an effective procedure for constructing critically finite real polynomial maps with specified combinatorics.

Dynamical Systems · Mathematics 2021-10-19 Araceli Bonifant , John Milnor , Scott Sutherland

We show that the Thurston seminorms of all finite covers of an aspherical 3-manifold determine whether it is a graph manifold, a mixed 3-manifold or hyperbolic.

Geometric Topology · Mathematics 2017-09-20 Michel Boileau , Stefan Friedl

We prove that every sufficiently large iterate of a Thurston map which is not doubly covered by a torus endomorphism and which does not have a Levy cycle is isotopic to the subdivision map of a finite subdivision rule. We determine which…

Dynamical Systems · Mathematics 2019-08-22 William Floyd , Walter Parry , Kevin M. Pilgrim

A Thurston map is a branched covering map from $\S^2$ to $\S^2$ with a finite postcritical set. We associate a natural Gromov hyperbolic graph $\G=\G(f,\mathcal C)$ with an expanding Thurston map $f$ and a Jordan curve $\mathcal C$ on…

Dynamical Systems · Mathematics 2014-02-14 Qian Yin

A rational map $\phi: \mathbb{P}^1 \to \mathbb{P}^1$ along with an ordered list of fixed and critical points is called a totally marked rational map. The space of totally marked degree two rational maps, $Rat^{tm}_2$ can be parametrized by…

Algebraic Geometry · Mathematics 2014-08-19 Anupam Bhatnagar

Mating is an operation to construct a rational map f from two polynomials, which are not in conjugate limbs of the Mandelbrot set. When the Thurston Algorithm for the unmodified formal mating is iterated in the case of postcritical…

Dynamical Systems · Mathematics 2017-06-14 Wolf Jung

It is shown that a formal mapping between two real-analytic hypersurfaces in complex space is convergent provided that neither hypersurface contains a nontrivial holomorphic variety. For higher codimensional generic submanifolds,…

Complex Variables · Mathematics 2007-05-23 M. S. Baouendi , P. Ebenfelt , L. P. Rothschild

For each integer $m \geq 1$, we construct a finite-dimensional family of rational maps, given by Blaschke-type products, whose restriction to the unit circle consists of $2m$-multimodal maps. We show that every post-critically finite…

Dynamical Systems · Mathematics 2026-05-08 Edson de Faria , Welington de Melo , Pedro A. S. Salomão , Edson Vargas

An orientation-preserving branched covering map $f\colon S^2 \to S^2$ is called a critically fixed Thurston map if $f$ fixes each of its critical points. It was recently shown that there is an explicit one-to-one correspondence between…

Dynamical Systems · Mathematics 2026-01-28 Mikhail Hlushchanka , Nikolai Prochorov

One of the most basic, longstanding open problems in the theory of dynamical systems is whether reachability is decidable for one-dimensional piecewise affine maps with two intervals. In this paper we prove that for injective maps, it is…

Dynamical Systems · Mathematics 2023-03-20 Faraz Ghahremani , Edon Kelmendi , Joël Ouaknine

We develop a general theory of "bisets": sets with two commuting group actions. They naturally encode topological correspondences. Just as van Kampen's theorem decomposes into a graph of groups the fundamental group of a space given with a…

Group Theory · Mathematics 2015-12-31 Laurent Bartholdi , Dzmitry Dudko

Let $Y\to X$ be a proper map between proper hyperbolic metric spaces. A Cannon--Thurston map is a continuous extension $\partial Y \to \partial X$. We prove that in most known settings in which a Cannon--Thurston map exists it is uniformly…

Geometric Topology · Mathematics 2026-03-25 Indranil Bhattacharyya , Rakesh Halder , Nir Lazarovich , Mahan Mj

In this paper, we study quasi post-critically finite degenerations for rational maps. We construct limits for such degenerations as geometrically finite rational maps on a finite tree of Riemann spheres. We prove the boundedness for such…

Dynamical Systems · Mathematics 2021-12-16 Yusheng Luo

A Thurston map is called nearly Euclidean if its local degree at each critical point is 2 and it has exactly four postcritical points. Nearly Euclidean Thurston (NET) maps are simple generalizations of rational Lattes maps. We investigate…

Dynamical Systems · Mathematics 2015-07-07 Edgar A. Saenz

Let f be an obstructed Thurston map with canonical obstruction \Gamma_f. We prove the following generalization of Pilgrim's conjecture: if the first-return map F of a periodic component C of the topological surface obtained from the sphere…

Dynamical Systems · Mathematics 2013-02-20 Nikita Selinger

In the second paper [LZ24b] of this series, we obtained an analog of the prime number theorem for a class of branched covering maps on the $2$-sphere $S^2$ called expanding Thurston maps, which are topological models of some non-uniformly…

Dynamical Systems · Mathematics 2024-12-31 Zhiqiang Li , Tianyi Zheng