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Conditions are given under which an infinitesimal automorphism of a torsion-free connection preserving a symplectic form is necessarily a symplectic vector field. An example is given of a compact symplectic manifold admitting a flat…

Differential Geometry · Mathematics 2016-04-28 Daniel J. F. Fox

We first give a relative flexible process to construct torsion cohomology classes for Shimura varieties of Kottwitz-Harris-Taylor type with coefficient in a non too regular local system. We then prove that associated to each torsion…

Number Theory · Mathematics 2017-01-03 Pascal Boyer

It is shown that the geometry of locally homogeneous multisymplectic manifolds (that is, smooth manifolds equipped with a closed nondegenerate form of degree > 1, which is locally homogeneous of degree k with respect to a local Euler field)…

Differential Geometry · Mathematics 2016-04-11 A. Echeverría-Enríquez , A. Ibort , M. C. Muñoz-Lecanda , N. Román-Roy

The main aim of the present paper is to introduce new classes of functions called $ \alpha $ $^m $ continuous maps and $ \alpha $ $^m $ irresolute maps. We obtain some characterizations of these classes and properties are studied.

General Topology · Mathematics 2016-01-15 Milby Mathew , R. Parimelazhagan , S. Jafari

The starting point of this paper is the existence of Peano curves, that is, continuous surjections mapping the unit interval onto the unit square. From this fact one can easily construct of a continuous surjection from the real line…

General Topology · Mathematics 2015-10-01 N. Albuquerque , L. Bernal-Gonzalez , D. Pellegrino , J. B. Seoane-Sepulveda

Let E be a topological space and F a uniform space. We introduce a new topology (in fact a uniform structure) called the V-congergence on the space of applications from E to F such that C(E,F) is closed for this topology and the restriction…

General Topology · Mathematics 2010-01-20 Nicolas Bouleau

We propose a homology theory for locally compact spaces with ends in which the ends play a special role. The approach is motivated by results for graphs with ends, where it has been highly successful. But it was unclear how the original…

Algebraic Topology · Mathematics 2011-05-26 Reinhard Diestel , Philipp Sprüssel

Let X be an irreducible smooth complex projective curve of genus g at least 4. Let M(r,\Lambda) be the moduli space of stable vector bundles over X or rank r and fixed determinant \Lambda, of degree d. We give a new proof of the fact that…

Algebraic Geometry · Mathematics 2012-02-15 Indranil Biswas , Tomas L. Gomez , V. Munoz

One of the prime motivation for topology was Homotopy theory, which captures the general idea of a continuous transformation between two entities, which may be spaces or maps. In later decades, an algebraic formulation of topology was…

Category Theory · Mathematics 2025-11-24 Suddhasattwa Das

Let $X$ be a compact toric variety. Let $Hol$ denote the space of based holomorphic maps from $CP^1$ to $X$ which lie in a fixed homotopy class. Let $Map$ denote the corresponding space of continuous maps. We show that $Hol$ has the same…

alg-geom · Mathematics 2008-02-03 Martin A. Guest

Persistent homology enables fast and computable comparison of topological objects. However, it is naturally limited to the analysis of topological spaces. We extend the theory of persistence, by guaranteeing robustness and computability to…

Combinatorics · Mathematics 2020-09-16 Mattia G. Bergomi , Massimo Ferri , Pietro Vertechi , Lorenzo Zuffi

The main purpose of this paper is to describe some published results and outline corresponding approaches which when applied to automorphism groups of algebras or groups establish that these groups are linear or non-linear.

Group Theory · Mathematics 2017-09-28 Vitalii Roman'kov

Let $V$ be a left vector space over a division ring and let ${\mathcal P}(V)$ be the associated projective space. We describe all finite subsets $X\subset V$ such that every permutation on $X$ can be extended to a linear automorphism of $V$…

Group Theory · Mathematics 2012-06-28 Mark Pankov

This paper presents a new version of boundary on coarse spaces. The space of ends functor maps coarse metric spaces to uniform topological spaces and coarse maps to uniformly continuous maps.

Metric Geometry · Mathematics 2019-07-08 Elisa Hartmann

Typical properties of measure space automorphisms with respect to the Halmos and Alpern-Tikhonov metrics are discussed.

Dynamical Systems · Mathematics 2024-09-25 Valery V. Ryzhikov

A general overview of the phenomenon of automatic continuity of homomorphisms between Polish groups is given. In particular, we study variants and improvements of the closed graph theorem, applying these to the problem of continuity of…

Group Theory · Mathematics 2025-09-16 Christian Rosendal , Luis Carlos Suarez

We show that a minimal toplogical dynamical system that is frequently stable if and only if it is almost automorphic.

Dynamical Systems · Mathematics 2024-05-21 Leiye Xu , Zongrui Hu

We develop a class of homeomorphisms on a compact homogeneous space of a transitive group action and show how the class sheds new light on a decomposition problem. We further use this class to show that every such homogeneous space in a…

Functional Analysis · Mathematics 2023-08-22 Samuel A. Hokamp

For a large class of tilings, including the Penrose tiling in two dimension as well as the icosahedral ones in 3 dimension, the continuous hull of such a tiling inherits a minimal lamination structure with flat leaves and a transversal…

Dynamical Systems · Mathematics 2007-05-23 Jean Bellissard , Riccardo Benedetti , Jean-Marc Gambaudo

We study the completions of the space of Hamiltonian diffeomorphisms of the standard linear symplectic space, for Viterbo's distance and some others derived from it, we study their different inclusions and give some of their properties. In…

Symplectic Geometry · Mathematics 2013-06-27 Vincent Humilière