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We describe a new algorithm for computing braid orbits on Nielsen classes. As an application we classify all families of affine genus zero systems; that is all families of coverings of the Riemann sphere by itself such that the monodromy…

Group Theory · Mathematics 2016-07-27 Kay Magaard , Sergey Shpectorov , Gehao Wang

In this paper, we study matricial representations of certain finitely presented groups with N-generators of order-2. As an application, we consider a group algebra under our representations. Specifically, we characterize the inverses of all…

Representation Theory · Mathematics 2015-12-14 Ryan Golden , Ilwoo Cho

This is the second paper in a series of three papers. In the first paper of the series, "Artinian Gorenstein algebras with linear resolutions", (arXiv:1306.2523, J. of Algebra, to appear) we prove that it is possible to give the minimal…

Commutative Algebra · Mathematics 2014-08-29 Sabine El Khoury , Andrew R. Kustin

We present an example of a quadratic algebra given by three generators and three relations, which is automaton (the set of normal words forms a regular language) and such that its ideal of relations does not possess a finite Gr\"obner basis…

Rings and Algebras · Mathematics 2020-08-04 Natalia Iyudu , Stanislav Shkarin

We define and characterize the $\gamma$-matrix associated to Pascal-like matrices that are defined by ordinary and exponential Riordan arrays. We also define and characterize the $\gamma$-matrix of the reversions of these triangles, in the…

Combinatorics · Mathematics 2018-04-16 Paul Barry

This is a brief review of our recent work attempted at a generalization of the Grassmann algebra to the paragrassmann ones. The main aim is constructing an algebraic basis for representing `fractional' symmetries appearing in $2D$…

High Energy Physics - Theory · Physics 2007-05-23 A. T. Filippov , A. B. Kurdikov

In representation theory of algebras, there exist two types of mutation pairs: rigid type (cluster-tilting mutations by Iyama-Yoshino) and simple-minded type (mutations of simple-minded systems by Sim\~oes-Pauksztello). It is known that…

Representation Theory · Mathematics 2025-01-20 Ryota Iitsuka

$N\leq 8$ 3-algebras have recently appeared in N-supersymmetric 3-dimensional Chern-Simons gauge theories. In our previous paper we classified linearly compact simple N = 8 n-algebras for any $n \geq 3$. In the present paper we classify…

Quantum Algebra · Mathematics 2014-01-22 Nicoletta Cantarini , Victor G. Kac

We prove the existence of a new algorithm for 3-sphere recognition based on Groebner basis methods applied to the variety of $\text{\em SL}(2,\C)$-representation of the fundamental group. An essential input is a recent result of the second…

Geometric Topology · Mathematics 2016-10-17 Michael Heusener , Raphael Zentner

We classify gradings by arbitrary abelian groups on the classical simple Lie superalgebras $P(n)$, $n \geq 2$, and on the simple associative superalgebras $M(m,n)$, $m, n \geq 1$, over an algebraically closed field: fine gradings up to…

Rings and Algebras · Mathematics 2017-07-14 Helen Samara Dos Santos , Caio De Naday Hornhardt , Mikhail Kochetov

The class of finitely presented algebras over a field $K$ with a set of generators $a_{1},..., a_{n}$ and defined by homogeneous relations of the form $a_{1}a_{2}... a_{n} =a_{\sigma (a)} a_{\sigma (2)} ... a_{\sigma (n)}$, where $\sigma$…

Rings and Algebras · Mathematics 2008-10-03 F. Cedo , E. Jespers , J. Okninksi

In this paper we study the algebra of graph invariants, focusing mainly on the invariants of simple graphs. All other invariants, such as sorted eigenvalues, degree sequences and canonical permutations, belong to this algebra. In fact,…

Combinatorics · Mathematics 2008-01-30 Tomi Mikkonen , Xavier Buchwalder

We extend the BMS(4) group by adding logarithmic supertranslations. This is done by relaxing the boundary conditions on the metric and its conjugate momentum at spatial infinity in order to allow logarithmic terms of carefully designed form…

High Energy Physics - Theory · Physics 2023-03-22 Oscar Fuentealba , Marc Henneaux , Cédric Troessaert

We present a Mathematica package for doing computations with gamma matrices, spinors, tensors and other objects, in any dimension and signature. The approach we use is based on defining the commutation relations of the relevant matrices,…

High Energy Physics - Theory · Physics 2019-05-03 Pyry Kuusela

We propose a realistic model with Majorana neutrinos in the framework of unifying the three generations of fermions by point interactions in an extra dimension. This model can simultaneously explain the origin of fermion generations,…

High Energy Physics - Phenomenology · Physics 2016-02-15 Chengfeng Cai , Hong-Hao Zhang

We introduce a rich family of generalizations of the pentagram map sharing the property that each generates an infinite configuration of points and lines with four points on each line. These systems all have a description as $Y$-mutations…

Dynamical Systems · Mathematics 2017-05-17 Max Glick , Pavlo Pylyavskyy

We have defined weight of the pair $(\langle S \mid R \rangle, R)$ for a given presentation $\langle S \mid R \rangle$ of a group, where the number of generators is equal to the number of relations. We present an algorithm to construct…

Geometric Topology · Mathematics 2016-10-28 Biplab Basak

This paper presents a self-contained introduction into the instanton representation of Plebanski gravity (IRPG), a GR formulation which uses a gauge connection and a three by three matrix as basic variables. In this paper we explore some…

General Physics · Physics 2015-06-05 Eyo Eyo Ita

In this paper, we construct and classify a new family of flips, called generalized Grassmannian flips, by generalizing the construction of standard flips for $\mathbb{P}^m\times \mathbb{P}^n$ to any generalized Grassmannian $G/P$, where $P$…

Algebraic Geometry · Mathematics 2023-09-21 Naichung Conan Leung , Ying Xie

We prove that if $X$ is a rationally connected threefold and $G$ is a $p$-subgroup in the group of birational selfmaps of $X$, then $G$ is an abelian group generated by at most $3$ elements provided that $p\ge 17$. We also prove a similar…

Algebraic Geometry · Mathematics 2017-09-11 Yuri Prokhorov , Constantin Shramov