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This article belongs to a subject, Directed Algebraic Topology, whose general aim is including non-reversible processes in the range of topology and algebraic topology. Here, as a further step, we also want to cover "critical processes",…

Algebraic Topology · Mathematics 2024-01-30 Marco Grandis

We consider the maximal number of arbitrary points in a special fibre that can be simultaneously approached by points in one sequence of general fibres. Several results about this topological invariant and their applications describe the…

alg-geom · Mathematics 2008-02-03 Michal Kwiecinski , Piotr Tworzewski

A continuous-time dynamical system with parameter $\varepsilon$ is nearly-periodic if all its trajectories are periodic with nowhere-vanishing angular frequency as $\varepsilon$ approaches 0. Nearly-periodic maps are discrete-time analogues…

Machine Learning · Computer Science 2023-05-11 Valentin Duruisseaux , Joshua W. Burby , Qi Tang

We characterize the fixed sets of automorphisms of an arbitrary countable, arithmetically saturated structure.

Logic · Mathematics 2026-05-21 James Schmerl

We describe an explicit method for constructing pseudo-automorphisms of a space $X$ which is obtained by blowing up points of $P^k$ (or a product $P^k \times \cdots \times P^k$). The centers of blowup are chosen to lie on an elliptic normal…

Dynamical Systems · Mathematics 2014-01-13 Eric Bedford , Jeffery Diller , Kyounghee Kim

We apply round-off to planar rotations, obtaining a one-parameter family of invertible maps of a two-dimensional lattice. As the angle of rotation approaches pi/2, the fourth iterate of the map produces piecewise-rectilinear motion, which…

Dynamical Systems · Mathematics 2015-06-19 Heather Reeve-Black , Franco Vivaldi

Architected materials achieve unique mechanical properties through precisely engineered microstructures that minimize material usage. However, a key challenge of low-density materials is balancing high stiffness with stable deformability up…

Materials Science · Physics 2024-09-20 Matheus I. N. Rosa , Konstantinos Karapiperis , Kaoutar Radi , Dennis M. Kochmann

We continue our study of the dynamics of mappings with small topological degree on (projective) complex surfaces. Previously, under mild hypotheses, we have constructed an ergodic ``equilibrium'' measure for each such mapping. Here we study…

Dynamical Systems · Mathematics 2009-09-10 Jeffrey Diller , Romain Dujardin , Vincent Guedj

Solenoids induced by split sequences are introduced, as the inverse limit object of a sequence of fold maps. The topology of a solenoid is explored, and it is established that solenoids have naturally arising singular foliated structures.…

Dynamical Systems · Mathematics 2025-04-09 Sarasi Jayasekara

We use a concise method to construct pseudo-automorphisms f_n of the first dynamical degree d_1(f_n) > 1 on the blowups of the projective n-space for all n > 1 and more generally on the blowups of products of projective spaces. These f_n,…

Dynamical Systems · Mathematics 2018-09-24 Fabio Perroni , De-Qi Zhang

We study topological properties of automorphisms of a 6-dimensional torus generated by integer matrices symplectic with respect to either the standard symplectic structure in six-dimensional linear space or a nonstandard symplectic…

Dynamical Systems · Mathematics 2022-12-13 L. M. Lerman , K. N. Trifonov

We consider definable topological spaces of dimension one in o-minimal structures, and state several equivalent conditions for when such a topological space $\left(X,\tau\right)$ is definably homeomorphic to an affine definable space…

Logic · Mathematics 2019-04-30 Ya'acov Peterzil , Ayala Rosel

We discuss the dependence of set-valued dynamical systems on parameters. Under mild assumptions which are often satisfied for random dynamical systems with bounded noise and control systems, we establish the fact that topological…

Dynamical Systems · Mathematics 2022-02-10 Jeroen S. W. Lamb , Martin Rasmussen , Christian S. Rodrigues

We consider automorphism groups of some countably categorical structures and their precompact expansions. We prove that automorphism groups of omega-stable omega-categorical structures have metrizable universal minimal flows. We also study…

Logic · Mathematics 2014-12-23 Aleksander Ivanov

In this paper, we consider the asymptotic dynamics of the skew-product semiflow generated by the following time almost-periodically forced scalar reaction-diffusion equation \begin{equation}\label{eq0} u_{t}=u_{xx}+f(t,u,u_{x}),\,\,t>0,\,…

Dynamical Systems · Mathematics 2020-07-14 Wenxian Shen , Yi Wang , Dun Zhou

We generalize a result of Lindenstrauss on the interplay between measurable and topological dynamics which shows that every separable ergodic measurably distal dynamical system has a minimal distal model. We show that such a model can, in…

Dynamical Systems · Mathematics 2022-08-04 Nikolai Edeko , Henrik Kreidler

We construct minimal laminations by hyperbolic surfaces whose generic leaf is a disk and contain any prescribed family of surfaces and with a precise control of the topologies of the surfaces that appear. The laminations are constructed via…

Geometric Topology · Mathematics 2022-02-03 Sébastien Alvarez , Joaquín Brum , Matilde Martínez , Rafael Potrie

We introduce the notion of fully simple maps, which are maps with non self-intersecting disjoint boundaries. In contrast, maps where such a restriction is not imposed are called ordinary. We study in detail the combinatorics of fully simple…

Mathematical Physics · Physics 2023-07-07 Gaëtan Borot , Elba Garcia-Failde

We introduce a new perspective on a procedure for generating pseudo-Anosov homemorphisms from postcritically finite interval maps. The central idea is the realization of a tree structure on one such family of pseudo-Anosovs: individual…

Geometric Topology · Mathematics 2023-03-03 Ethan Farber

We display a new family of prime ideals with unbounded minimal number of generators in a three-dimensional power series ring over a field of characteristic zero. These primes are obtained as the kernel of a quasi-monomial algebra…

Commutative Algebra · Mathematics 2026-04-02 Laura González , Francesc Planas-Vilanova