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The author determines the structure of automorphism groups of smooth plane curves of degree at least four. Furthermore, he gives some upper bounds for the order of automorphism groups of smooth plane curves and classifies the cases with…

Algebraic Geometry · Mathematics 2014-06-10 Takeshi Harui

The goal of this paper is to describe a theoretical construction of an infinite collection of non-classical Schottky groups. We first show that there are infinitely many non-classical noded Schottky groups on the boundary of Schottky space,…

Geometric Topology · Mathematics 2018-01-11 Ruben A. Hidalgo , Bernard Maskit

In this article we consider diffeomorphism groups of manifolds with smooth boundary. We show that the diffeomorphism groups of the manifold and its boundary fit into a short exact sequence which admits local sections. In other words, they…

Differential Geometry · Mathematics 2025-04-01 Erlend Grong , Alexander Schmeding

We present some results dealing with the local geometry of almost complex manifolds. We establish mainly the complete hyperbolicity of strictly pseudoconvex domains, the extension of plurisubharmonic functions through generic submanifolds…

Complex Variables · Mathematics 2007-05-23 Bernard Coupet , Herve Gaussier , Alexandre Sukhov

It is shown that certain diffeomorphism or homeomorphism groups with no restriction on support of an open manifold with finite number of ends are bounded. It follows that these groups are uniformly perfect. In order to characterize the…

Differential Geometry · Mathematics 2011-04-20 Tomasz Rybicki

We study the automorphism group of graphons (graph limits). We prove that after an appropriate "standardization" of the graphon, the automorphism group is compact. Furthermore, we characterize the orbits of the automorphism group on…

Combinatorics · Mathematics 2021-02-17 László Lovász , Balázs Szegedy

Mapping class groups of locally finite graphs are the analogue of those of infinite-type surfaces, and serve as a "big" version of $\text{Out}(F_n)$. In this paper, we investigate which of these mapping class groups have a dense conjugacy…

Geometric Topology · Mathematics 2026-01-09 Rachmiel Klein

We study the boundary of an affine invariant submanifold of a stratum of translation surfaces in a partial compactification consisting of all finite area Abelian differentials over nodal Riemann surfaces, modulo zero area components. The…

Dynamical Systems · Mathematics 2020-07-15 Maryam Mirzakhani , Alex Wright

We construct a smooth rational affine surface S with finite automorphism group but with the property that the group of automorphisms of the cylinder SxA^2 acts infinitely transitively on the complement of a closed subset of codimension at…

Algebraic Geometry · Mathematics 2013-04-16 Adrien Dubouloz

We show that every bordered Riemann surface, $M$, with smooth boundary $bM$ admits a proper holomorphic map $M\to \Omega$ into any bounded strongly pseudoconvex domain $\Omega$ in $\mathbb C^n$, $n>1$, extending to a smooth map $f:\overline…

Complex Variables · Mathematics 2023-08-07 Franc Forstneric

In this note we prove that the mapping class group of a compact topological manifold $M$ with boundary is of finite type, under assumptions on its dimension and connectivity.

Geometric Topology · Mathematics 2024-04-04 Alexander Kupers

We describe the full automorphism group of the directed reduced power graph and the undirected reduced power graph of a finite group. We compute the full automorphism groups of these graphs of several classes of finite groups. Also, we…

Group Theory · Mathematics 2024-11-15 T. Anitha , R. Rajkumar

We study unknottedness for free boundary minimal surfaces in a three-dimensional Riemannian manifold with nonnegative Ricci curvature and strictly convex boundary, and for self-shrinkers in the three-dimensional Euclidean space. For doing…

Differential Geometry · Mathematics 2025-12-02 Sabine Chu , Giada Franz

In this paper we study the integral cohomology of pure mapping class groups of surfaces, and other related groups and spaces, as FI-modules. We use recent results from Church, Miller, Nagpal and Reinhold to obtain explicit linear bounds for…

Algebraic Topology · Mathematics 2019-01-09 Rita Jimenez Rolland

We construct a strictly pseudoconvex domain with smooth boundary whose squeezing function is not plurisubharmonic.

Complex Variables · Mathematics 2016-04-28 John Erik Fornæss , Nikolay Shcherbina

We describe a family of rational affine surfaces S with huge groups of automorphisms in the following sense: the normal subgroup of Aut(S) generated by all its algebraic subgroups is not generated by any countable family of such subgroups,…

Algebraic Geometry · Mathematics 2013-02-18 Jérémy Blanc , Adrien Dubouloz

We prove that the automorphism group of a compact complex parallelizable manifold is Jordan. In the course of the proof we show that outer automorphism groups of cocompact lattices in complex Lie groups have bounded finite subgroups.

Algebraic Geometry · Mathematics 2023-12-01 Aleksei Golota

We show that the de Rham Hilbert complex with mixed boundary conditions on bounded strong Lipschitz domains is closed and compact. The crucial results are compact embeddings which follow by abstract arguments using functional analysis…

Analysis of PDEs · Mathematics 2022-03-14 Dirk Pauly , Michael Schomburg

We classify finite groups that can act by automorphisms and birational automorphisms on non-trivial Severi-Brauer surfaces over fields of characteristic zero.

Algebraic Geometry · Mathematics 2020-12-18 Constantin Shramov

We introduce asymptotically rigid mapping class groups of handlebodies and determine their finiteness properties, which vary depending on the space of ends of the underlying handlebody. As it turns out, in some cases, the homology of these…

Geometric Topology · Mathematics 2025-04-09 Sergio Domingo-Zubiaga