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Diagram semigroups are interesting algebraic and combinatorial objects, several types of them originating from questions in computer science and in physics. Here we describe diagram semigroups in a general framework and extend our…

Group Theory · Mathematics 2015-02-27 James East , Attila Egri-Nagy , Andrew R. Francis , James D. Mitchell

In this note we introduce generalised pairs from the perspective of the evolution of the notion of space in birational algebraic geometry. We describe some applications of generalised pairs in recent years and then mention a few open…

Algebraic Geometry · Mathematics 2020-08-10 Caucher Birkar

In this paper we look into the structure of finite-dimensional graded superalgebras of various types such as associative, Lie and Jordan over an algebraically closed field of characteristic zero.

Rings and Algebras · Mathematics 2007-09-13 M. Tvalavadze , T. Tvalavadze

This article develops an alcove geometric approach to the representation theory of certain affine Hecke algebra quotients generalizing the blob algebra; and gives an exposition of some new representations of these algebras.

Representation Theory · Mathematics 2007-05-23 Paul P Martin , David Woodcock

We discuss two properties of an abelian variety, namely, being a direct summand in a product of Jacobians and the weaker property of being "split". We relate the first property to the integral Hodge conjecture for curve classes on abelian…

Algebraic Geometry · Mathematics 2023-07-07 Claire Voisin

We introduce the notion of Glanon groupoids, which are Lie groupoids equipped with multiplicative generalized complex structures. It combines symplectic groupoids, holomorphic Lie groupoids and holomorphic Poisson groupoids into a unified…

Differential Geometry · Mathematics 2017-08-08 Madeleine Jotz , Mathieu Stiénon , Ping Xu

We prove that an analogue of Jordan's theorem on finite subgroups of general linear groups holds for the groups of biregular automorphisms of algebraic surfaces. This gives a positive answer to a question of Vladimir L. Popov.

Algebraic Geometry · Mathematics 2014-06-20 Tatiana Bandman , Yuri G. Zarhin

Using the adjoint representations of Lie algebras, we classify all Jacobi structures on real two- and three-dimensional Lie groups. Also, we study Jacobi-Lie systems on these real low-dimensional Lie groups. Our results are illustrated…

Mathematical Physics · Physics 2020-11-24 H. Amirzadeh-Fard , Gh. Haghighatdoost , P. Kheradmandynia , A. Rezaei-Aghdam

We give a physicist oriented survey of Poisson-Lie symmetries of classical systems. We consider finite dimensional geometric actions and the chiral WZNW model as examples for the general construction. An essential point is that quadratic…

High Energy Physics - Theory · Physics 2009-10-22 Anton Alekseev , Ivan Todorov

The aim of this paper is to explain, mostly through examples, what groupoids are and how they describe symmetry. We will begin with elementary examples, with discrete symmetry, and end with examples in the differentiable setting which…

Representation Theory · Mathematics 2008-02-03 Alan Weinstein

We show how one can associate to a given class of finite type G-structures a classifying Lie algebroid. The corresponding Lie groupoid gives models for the different geometries that one can find in the class, and encodes also the different…

Differential Geometry · Mathematics 2008-07-25 Rui Loja Fernandes , Ivan Struchiner

We study the Picard groups of moduli spaces of smooth complex projective curves that have a group of automorphisms with a prescribed topological action. One of our main tools is the theory of symmetric mapping class groups. In the first…

Algebraic Geometry · Mathematics 2019-06-27 Kevin Kordek

We define the geometric simpleness for toroidal groups. We give an example of quasi-abelian variety which is geometrically simple, but not simple. We show that any quasi-abelian variety is isogenous to a product of geometrically simple…

Complex Variables · Mathematics 2018-09-24 Yukitaka Abe

The reductions of conformal field theories which lead to generalized abelian cosets are studied. Primary fields and correlation functions of arbitrary abelian coset conformal field theory are explicitly expressed in terms of those of the…

High Energy Physics - Theory · Physics 2011-03-18 A. V. Bratchikov

We introduce Cayley posets as posets arising naturally from pairs $S<T$ of semigroups, much in the same way that Cayley graph arises from a (semi)group and a subset. We show that Cayley posets are a common generalization of several known…

Combinatorics · Mathematics 2019-08-27 Ignacio García-Marco , Kolja Knauer , Guillaume Mercui-Voyant

We study hyperbolic curves and their Jacobians over finite fields in the context of anabelian geometry.

Algebraic Geometry · Mathematics 2008-02-27 Fedor Bogomolov , Mikhail Korotiaev , Yuri Tschinkel

We describe poles and the corresponding residual automorphic representations of Eisenstein series attached to maximal parabolic subgroups whose unipotent radicals admit Jordan algebra structure.

Representation Theory · Mathematics 2020-02-19 Marcela Hanzer , Gordan Savin

We give explicit constructions of sets S with the property that for each integer k, there are at most g solutions to k=s_1+s_2, s_i\in S; such sets are called Sidon sets if g=2 and generalized Sidon sets if g\ge 3. We extend to generalized…

Number Theory · Mathematics 2007-05-23 Greg Martin , Kevin O'Bryant

We prove that N\'eron models of jacobians of generically-smooth nodal curves over bases of arbitrary dimension are quasi-compact (hence of finite type) whenever they exist. We give a simple application to the orders of torsion subgroups of…

Algebraic Geometry · Mathematics 2016-04-08 David Holmes

We study a family of surfaces of general type that arises from the intersections of two translates of the theta divisor on a principally polarized complex abelian fourfold. In particular we determine the N\'eron-Severi lattices of these…

Algebraic Geometry · Mathematics 2016-03-22 Thomas Krämer