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In this paper we prove that given a non-isotrivial family of hyperbolic curves in positive characteristic, the isomorphism type of the geometric fundamental group is not constant on the fibres of the family.

Algebraic Geometry · Mathematics 2015-10-26 Mohamed Saidi , Akio Tamagawa

In this work we obtain a new criterion to establish ergodicity and non-uniform hyperbolicity of smooth measures of diffeomorphisms. This method allows us to give a more accurate description of certain ergodic components. The use of this…

Dynamical Systems · Mathematics 2019-12-19 F. Rodriguez Hertz , Jana Rodriguez Hertz , A. Tahzibi , R. Ures

We show the equivalence of several characterizations of relative hyperbolicity for metric spaces, and obtain extra information about geodesics in a relatively hyperbolic space. We apply this to characterize hyperbolically embedded subgroups…

Group Theory · Mathematics 2012-10-31 Alessandro Sisto

We show that word-hyperbolic groups satisfy linear isoperimetric functions for all homotopy types of surface diagrams. This generalises the linear isoperimetric functions for disc and annular diagrams.

Geometric Topology · Mathematics 2022-05-23 Macarena Arenas , Daniel T. Wise

The paper studies the complex differentiable functions of double argument and their properties, which are similar to the properties of the holomorphic functions of complex variable: the Cauchy formula, the hyperbolic harmonicity, the…

General Mathematics · Mathematics 2015-01-14 Dmitry Pavlov , Sergey Kokarev

We investigate orthogonal and symplectic bundles with parabolic structure, over a curve.

Algebraic Geometry · Mathematics 2012-03-30 Indranil Biswas , Souradeep Majumder , Michael Lennox Wong

We prove sharp bounds for the product and the sum of the hyperbolic lengths of a pair of hyperbolic adjacent sides of hyperbolic Lambert quadrilaterals in the unit disk. We also show the H\"older convexity of the inverse hyperbolic sine…

Metric Geometry · Mathematics 2018-10-04 Gendi Wang

In a conservative and partially hyperbolic three-dimensional setting, we study three representative classes of diffeomorphisms: those homotopic to Anosov (or Derived from Anosov diffeomorphisms), diffeomorphisms in neighborhoods of the…

Dynamical Systems · Mathematics 2025-04-18 Lorenzo J. Díaz , Jiagang Yang , Jinhua Zhang

The current paper is devoted to the study of integral curves of constant type in parabolic homogeneous spaces. We construct a canonical moving frame bundle for such curves and give the criterium when it turns out to be a Cartan connection.…

Differential Geometry · Mathematics 2013-07-02 Boris Doubrov , Igor Zelenko

We show that all hyperbolic surfaces admit an ideal triangulation with bounded shear parameters. This upper bound depends logarithmically on the topology of the surface.

Geometric Topology · Mathematics 2025-12-11 Marie Abadie

We define and study "hyperbolic forcing".

Differential Geometry · Mathematics 2016-09-21 Pedro Ontaneda

We show that for every non-elementary hyperbolic group the Bowen-Margulis current associated with a strongly hyperbolic metric forms a unique group-invariant Radon measure class of maximal Hausdorff dimension on the boundary square.…

Dynamical Systems · Mathematics 2023-06-22 Ryokichi Tanaka

We study conservative partially hyperbolic diffeomorphisms in hyperbolic 3-manifolds. We show that they are always accessible and deduce as a result that every conservative $C^{1+}$ partially hyperbolic in a hyperbolic 3-manifold must be…

Dynamical Systems · Mathematics 2022-03-07 Sergio Fenley , Rafael Potrie

Consider a three dimensional partially hyperbolic diffeomorphism. It is proven that under some rigid hypothesis on the tangent bundle dynamics, the map is (modulo finite covers and iterates) either an Anosov diffeomorphism, a skew-product…

Dynamical Systems · Mathematics 2020-06-30 Pablo D. Carrasco , Enrique Pujals , Federico Rodriguez-Hertz

The precise behavior of the quasi-hyperbolic metric near a $\mathcal C^{1,1}$-smooth part of the boundary of a domain in $\mathbb{R}^n$ is obtained.

Metric Geometry · Mathematics 2018-08-14 Nikolai Nikolov , Pascal J. Thomas

We consider the Anti-de Sitter space $\mathbb{H}^3_1$ equipped with Berger-like metrics, that deform the standard metric of $\mathbb{H}^3_1$ in the direction of the hyperbolic Hopf vector field. Helix surfaces are the ones forming a…

Differential Geometry · Mathematics 2023-01-19 Giovanni Calvaruso , Irene I. Onnis , Lorenzo Pellegrino , Daria Uccheddu

In this paper some concepts of convex analysis on hyperbolic space are studied. We first study properties of the intrinsic distance, for instance, we present the spectral decomposition of its Hessian. Next, we study the concept of convex…

Optimization and Control · Mathematics 2022-07-13 Orizon Pereira Ferreira , Sándor Zoltán Németh , Jinzhen Zhu

In this article we explore the relationship between the systole and the diameter of closed hyperbolic orientable surfaces. We show that they satisfy a certain inequality, which can be used to deduce that their ratio has a (genus dependent)…

Geometric Topology · Mathematics 2023-04-03 Florent Balacheff , Vincent Despré , Hugo Parlier

We discuss bases of the space of holomorphic quadratic differentials that are dual to the differentials of Fenchel-Nielsen coordinates and hence appear naturally when considering functions on the set of hyperbolic metrics which are…

Differential Geometry · Mathematics 2018-12-18 Nadine Große , Melanie Rupflin

This paper introduces the concept of average conformal hyperbolic sets, which admit only one positive and one negative Lyapunov exponents for any ergodic measure. For an average conformal hyperbolic set of a C1 diffeomorphism, utilizing the…

Dynamical Systems · Mathematics 2018-11-27 Juan Wang , Jing Wang , Yongluo Cao , Yun Zhao