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This is a survey on the automorphism groups in various classes of affine algebraic surfaces and the algebraic group actions on such surfaces. Being infinite-dimensional, these automorphism groups share some important features of algebraic…

Algebraic Geometry · Mathematics 2025-03-06 Sergei Kovalenko , Alexander Perepechko , Mikhail Zaidenberg

The development of the notion of group contraction first introduced by E. In{\"o}n{\"u} and E.P. Wigner in 1953 is briefly reviewed. The fundamental role of the idea of degenerate transformations is stressed. The significance of…

High Energy Physics - Theory · Physics 2007-05-23 N. A. Gromov

Different notions of amenability on hypergroups and their relations are studied. Developing Leptin's theorem for discrete hypergroups, we characterize the existence of a bounded approximate identity for hypergroup Fourier algebras. We study…

Functional Analysis · Mathematics 2016-02-29 Mahmood Alaghmandan

A new algebraic treatment of dependent type theory is proposed using ideas derived from topos theory and algebraic set theory.

Category Theory · Mathematics 2025-05-19 Steve Awodey

We apply to logic programming some recently emerging ideas from the field of reduction-based communicating systems, with the aim of giving evidence of the hidden interactions and the coordination mechanisms that rule the operational…

Logic in Computer Science · Computer Science 2007-05-23 Roberto Bruni , Ugo Montanari , Francesca Rossi

This exposition begins with a systematic account of the theory of group schemes, ultimately specializing to algebraic tori.

Algebraic Geometry · Mathematics 2021-01-01 Garth Warner

This paper is devoted to a new approach of the arithmetic of intervals. We present the set of intervals as a normed vector space. We define also a four-dimensional associative algebra whose product gives the product of intervals in any…

Numerical Analysis · Mathematics 2009-10-22 Nicolas Goze , Elisabeth Remm

Coupled relaxation oscillators, realized via chemical or other means, can exhibit a multiplicity of steady states, characterized by spatial patterns resulting from lateral inhibition. We show that perturbation-initiated transformations…

Pattern Formation and Solitons · Physics 2023-06-22 A. Parveena Shamim , Shakti N. Menon , Sitabhra Sinha

\pkg{multiplex} is a computer program that provides algebraic tools for the analysis of multiple network structures within the \proglang{R} environment. Apart from the possibility to create and manipulate multivariate data representing…

Social and Information Networks · Computer Science 2022-01-31 J Antonio Rivero Ostoic

This survey describes some recent work, by the authors and others, on the existence of algebraic fibrations of group extensions, as well as the finiteness properties of their algebraic fibers, in the realm of both abstract and pro-$p$…

Group Theory · Mathematics 2024-04-03 Dessislava H. Kochloukova , Stefano Vidussi

We study unital groups with a distinguished family of compressions called a compression base. A motivating example is the partially ordered additive group of a von Neumann algebra with all Naimark compressions as the compression base.

Quantum Physics · Physics 2009-11-11 D. J. Foulis

We create plots of algebraic integers in the complex plane, exploring the effect of sizing the integers according to various arithmetic invariants. We focus on Galois theoretic invariants, in particular creating plots which emphasize…

Number Theory · Mathematics 2022-02-24 Gabriel Dorfsman-Hopkins , Shuchang Xu

An axiomatic approach to the representation theory of Coxeter groups and their Hecke algebras was presented in [1]. Combinatorial aspects of this construction are studied in this paper. In particular, the symmetric group case is…

Representation Theory · Mathematics 2007-05-23 Ron M. Adin , Francesco Brenti , Yuval Roichman

The algebraic analysis of social systems, or algebraic social network analysis, refers to a collection of methods designed to extract information about the structure of a social system represented as a directed graph. Central among these…

Social and Information Networks · Computer Science 2026-03-03 Nima Motamed , Nina Otter , Emily Roff

These notes form an introduction to Lie algebras and group theory. Most of the material can be found in many works by various authors given in the list of references. The reader is referred to such works for more detail.

High Energy Physics - Theory · Physics 2012-05-16 Adil Belhaj

Some very elementary ideas about quantum groups and quantum algebras are introduced and a few examples of their physical applications are mentioned.

Mathematical Physics · Physics 2007-05-23 R. Jaganathan

In this paper, we give new characterizations of algebraic regularity by using differential forms and difference quotients.

Complex Variables · Mathematics 2017-06-01 Keqin Liu

GroupMath is a Mathematica package which performs several calculations related to semi-simple Lie algebras and the permutation groups, both of which are important in particle physics as well as in other areas of research.

High Energy Physics - Theory · Physics 2021-07-28 Renato M. Fonseca

This text is a survey of derived algebraic geometry. It covers a variety of general notions and results from the subject with a view on the recent developments at the interface with deformation quantization.

Algebraic Geometry · Mathematics 2014-09-15 Bertrand Toën

Due to the occurrence of large exceptional Lie groups in supergravity, calculations involving explicit Lie algebra and Lie group element manipulations easily become very complicated and hence also error-prone if done by hand. Research on…

High Energy Physics - Theory · Physics 2007-05-23 Thomas Fischbacher