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When working in Homotopy Type Theory and Univalent Foundations, the traditional role of the category of sets, Set, is replaced by the category hSet of homotopy sets (h-sets); types with h-propositional identity types. Many of the properties…

Logic in Computer Science · Computer Science 2025-02-19 Daniel Gratzer , Håkon Gylterud , Anders Mörtberg , Elisabeth Stenholm

This article deals with directional rotational deviations for non-wandering periodic point free homeomorphisms of the 2-torus which are homotopic to the identity. We prove that under mild assumptions, such a homeomorphism exhibits uniformly…

Dynamical Systems · Mathematics 2018-03-13 Alejandro Kocsard , Fernanda Pereira-Rodrigues

We expand the dictionary between the action of a torus homeomorphism on the fine curve graph and its rotation set. More precisely, we show that the fixed points at infinity of a loxodromic element determine the rotation set up to scale. A…

Group Theory · Mathematics 2025-11-25 Sebastian Hensel , Frédéric Le Roux

We study the interplay between the dynamics of area-preserving surface homeomorphisms homotopic to the identity and the topology of the surface. We define fully essential dynamics and generalize the results previously obtained on strictly…

Dynamical Systems · Mathematics 2016-11-21 Andres Koropecki , Fabio Armando Tal

We study the relationship between transitivity and topological chaos for homeomorphisms of the two torus. We show that if a transitive homeomorphism of $\mathbb{T}^2$ is homotopic to the identity and has both a fixed point and a periodic…

Dynamical Systems · Mathematics 2022-12-21 Pollyanna Vicente Nunes , Fabio Armando Tal

We prove that for a torus homeomorphism isotopic to the identity and with a lift whose rotation set is an interval, either every rational point in the rotation set is realized by a periodic orbit, or there exists an annular, essential,…

Dynamical Systems · Mathematics 2013-02-21 Pablo Dávalos

In the current study, the existence of periodic orbits around a fixed homogeneous cube is investigated, and the results have powerful implications for examining periodic orbits around non-spherical celestial bodies. In the two different…

Earth and Planetary Astrophysics · Physics 2011-08-25 Xiaodong Liu , Hexi Baoyin , Xingrui Ma

We study the rotation sets for homeomorphisms homotopic to the identity on the torus $\mathbb T^d$, $d\ge 2$. In the conservative setting, we prove that there exists a Baire residual subset of the set $\text{Homeo}_{0, \lambda}(\mathbb…

Dynamical Systems · Mathematics 2019-09-10 H. Lima , P. Varandas

We study main bifurcations of multidimensional diffeomorphisms having a non-transversal homoclinic orbit to a saddle-node fixed point. On a parameter plane we build a bifurcation diagram for single-round periodic orbits lying entirely in a…

Dynamical Systems · Mathematics 2014-12-03 S. V. Gonchenko , O. V. Gordeeva , V. I. Lukjanov , I. I. Ovsyannikov

We introduce the concept of a homotopy motion of a subset in a manifold, and give a systematic study of homotopy motions of surfaces in closed orientable 3-manifolds. This notion arises from various natural problems in 3-manifold theory…

Geometric Topology · Mathematics 2022-06-03 Yuya Koda , Makoto Sakuma

We show that every closed Lorentzian surface contains at least two closed geodesics. Explicit examples show the optimality of this claim. Refining this result we relate the least number of closed geodesics to the causal structure of the…

Differential Geometry · Mathematics 2014-02-24 Stefan Suhr

We construct a family $\{\Phi_t\}_{t\in[0,1]}$ of homeomorphisms of the two-torus isotopic to the identity, for which all of the rotation sets $\rho(\Phi_t)$ can be described explicitly. We analyze the bifurcations and typical behavior of…

Dynamical Systems · Mathematics 2015-10-20 Philip Boyland , André de Carvalho , Toby Hall

Here we study the behaviour of the horocyclic orbit of a vector on the unit tangent bundle of a geometrically infinite surface with variable negative curvature, when the corresponding geodesic ray is almost minimizing and the injectivity…

Dynamical Systems · Mathematics 2023-05-29 Victoria García

We define and study homotopy groups of cubical sets. To this end, we give four definitions of homotopy groups of a cubical set, prove that they are equivalent, and further that they agree with their topological analogues via the geometric…

Algebraic Topology · Mathematics 2025-12-23 Daniel Carranza , Chris Kapulkin

Let p be a saddle fixed point for an orientation-preserving surface diffeomorphism f admitting a homoclinic point q. Let V be an open 2-cell bounded by a simple loop formed by two arcs joining p to q lying respectively in the stable and…

Dynamical Systems · Mathematics 2007-05-23 Morris W. Hirsch

Homotopy comomentum maps are a higher generalization of the notion of moment map introduced to extend the concept of Hamiltonian actions to the framework of multisymplectic geometry. Loosely speaking, higher means passing from considering…

Symplectic Geometry · Mathematics 2025-11-10 Antonio Michele Miti

We track the trajectories of individual horocycles on the modular surface. Our tracking is constructive, and we thus \emph{effectively} establish topological transitivity and even line-transitivity for the horocyclic flow. We also describe…

Number Theory · Mathematics 2011-09-06 Marvin Knopp , Mark Sheingorn

We study cocycles of homeomorphisms of $\T$ in the isotopy class of the identity over shift spaces, using as a tool a novel definition of rotation sets inspired in the classical work of Miziurewicz and Zieman. We discuss different notions…

Dynamical Systems · Mathematics 2025-10-15 Catalina Freijo , Fabio Tal

We prove the existence of an open and dense set D\subset? Homeo0(T2) (set of toral homeomorphisms homotopic to the identity) such that the rotation set of any element in D is a rational polygon. We also extend this result to the set of…

Dynamical Systems · Mathematics 2014-02-26 Alejandro Passeggi

A homothety surface can be assembled from polygons by identifying their edges in pairs via homotheties, which are compositions of translation and scaling. We consider linear trajectories on a 1-parameter family of genus-2 homothety…

Geometric Topology · Mathematics 2018-08-27 Joshua Bowman , Slade Sanderson