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In this paper, all finite groups whose commuting (non-commuting) graphs can be embed on the plane, torus or projective plane are classified.

We provide an explicit characterization of the covariant isotropy group of any Grothendieck topos, i.e. the group of (extended) inner automorphisms of any sheaf over a small site. As a consequence, we obtain an explicit characterization of…

Category Theory · Mathematics 2021-04-29 Jason Parker

A toric arrangement is a finite set of hypersurfaces in a complex torus, every hypersurface being the kernel of a character. In the present paper we build a CW-complex homotopy equivalent to the arrangement complement, with a combinatorial…

Algebraic Topology · Mathematics 2010-10-29 Luca Moci , Simona Settepanella

In this paper we characterize all of Cayley graphs on dihedral groups with metric dimension two.

Combinatorics · Mathematics 2017-01-31 Ali Behtoei , Yaser Golkhandypour

This is the first chapter in our "Toric Topology" book project. Further chapters are coming. Comments and suggestions are very welcome.

Combinatorics · Mathematics 2012-10-10 Victor Buchstaber , Taras Panov

We give a complete coarse classification of Legendrian and transverse torus knots in any contact structure on $S^3$.

Geometric Topology · Mathematics 2022-07-01 John B. Etnyre , Hyunki Min , Anubhav Mukherjee

In this note we classify simply connected rationally elliptic compact toric orbifolds up to algebraic isomorphism.

Algebraic Topology · Mathematics 2021-07-26 Michael Wiemeler

We investigate the subgroup structure of the hyperoctahedral group in six dimensions. In particular, we study the subgroups isomorphic to the icosahedral group. We classify the orthogonal crystallographic representations of the icosahedral…

Group Theory · Mathematics 2015-06-23 Emilio Zappa , Eric C. Dykeman , Reidun Twarock

We present a diagram surveying equivalence or strict implication for properties of different nature (algebraic, model theoretic, topological, etc.) about groups definable in o-minimal structures. All results are well-known and an extensive…

Logic · Mathematics 2020-10-29 Annalisa Conversano

We classify all groups which can occur as the topological symmetry group of some embedding of the Heawood graph in $S^3$.

Geometric Topology · Mathematics 2019-10-21 Emille Davie Lawrence , Erica Flapan , Robin T. Wilson

The definition of the complement of a fuzzy subset is algebraic in nature and when it is used in the context of fuzzy topological spaces it does not share any similarity with the usual property of topological spaces that the complement of…

General Topology · Mathematics 2025-08-25 Anjeza Krakulli , Elton Pasku

This is an exposition of the homological classification of actions of surface groups on the plane, in every degree of smoothness.

Dynamical Systems · Mathematics 2009-10-16 Danny Calegari

It is shown that the compactly supported identity component of the diffeomorphism group of the 2-dimensional punctured torus $\mathbb T^2_p$ is an unbounded group. It follows that the fragmentation norm of $\mathbb T^2_p$ is unbounded.

Differential Geometry · Mathematics 2011-04-05 Tomasz Rybicki

A toroidal group is a generalization of a complex torus, and is obtained as the quotient of the complex Euclidean space $\mathbb{C}^n$ by a discrete subgroup. Toroidal groups with finite-dimensional cohomology, called theta toroidal groups,…

Complex Variables · Mathematics 2025-12-29 Jinichiro Tanaka

We describe the equivariant cobordism ring of smooth toric varieties. This equivariant description is used to compute the ordinary cobordism ring of such varieties.

Algebraic Geometry · Mathematics 2010-11-03 Amalendu Krishna , V. Uma

We give a general construction of topological groups from combinatorial structures such as trees, towers, gaps, and subadditive functions. We connect topological properties of corresponding groups with combinatorial properties of these…

General Topology · Mathematics 2025-06-24 Boriša Kuzeljević , Stepan Milošević , Stevo Todorčević

We study entire holomorphic curves in the algebraic torus, and show that they can be characterized by the ``growth rate'' of their derivatives.

Complex Variables · Mathematics 2009-01-26 Masaki Tsukamoto

This is a review of the fundamental concepts of general topology.

General Mathematics · Mathematics 2022-02-03 Farzad Shahi

This is the second chapter in our "Toric Topology" book project. Further chapters are coming. Comments and suggestions are very welcome.

Algebraic Topology · Mathematics 2012-10-10 Victor Buchstaber , Taras Panov

Let $f:X \to Y$ be a proper morphism of normal varieties with $f_*\mathcal{O}_X = \mathcal{O}_Y$. If $X$ is toric, then $Y$ is toric and $f$ is a toric morphism for some toric structures on $X$ and $Y$.

Algebraic Geometry · Mathematics 2023-09-26 Hiromu Tanaka