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We introduce the inverse monoid of inner partial automorphisms of a semigroup -- a tool that associates to every semigroup an inverse semigroup. When the semigroup is a group, this inverse semigroup is isomorphic to the group of inner…

Comtrans algebras, arising in web geometry, have two trilinear operations, commutator and translator. We determine a Gr\"obner basis for the comtrans operad, and state a conjecture on its dimension formula. We study multilinear polynomial…

Rings and Algebras · Mathematics 2025-08-01 Murray R. Bremner , Hader A. Elgendy

We describe those group algebras over fields of characteristic different from 2 whose units symmetric with respect to the classical involution, satisfy some group identity.

Rings and Algebras · Mathematics 2007-05-23 Victor Bovdi

We study the problem of modeling a binary operation that satisfies some algebraic requirements. We first construct a neural network architecture for Abelian group operations and derive a universal approximation property. Then, we extend it…

Machine Learning · Computer Science 2021-02-25 Kenshin Abe , Takanori Maehara , Issei Sato

In this note we prove a selection of commutativity theorems for various classes of semigroups. For instance, if in a separative or completely regular semigroup $S$ we have $x^p y^p = y^p x^p$ and $x^q y^q = y^q x^q$ for all $x,y\in S$ where…

Group Theory · Mathematics 2021-01-19 Francisco Araújo , Michael Kinyon

We extend the theory (formal part only} of algebras with one binary operation (our paper arXiv:math/0110333v1 [math.RA] 31 Oct 2001) to algebras with several operations of any arity.

Logic · Mathematics 2015-06-03 Constantin M. Petridi

This paper enriches the list of known properties of congruence sequences starting from the universal relation and successively performing the operators lower $k$ and lower $t$. Two series of inverse semigroups, namely…

Group Theory · Mathematics 2019-03-19 Ying-Ying Feng , Li-Min Wang , Lu Zhang , Hai-Yuan Huang

In this work we characterize shift spaces over infinite countable alphabets that can be endowed with an inverse semigroup operation. We give sufficient conditions under which zero-dimensional inverse semigroups can be recoded as shift…

Dynamical Systems · Mathematics 2018-02-15 Daniel Gonçalves , Marcelo Sobottka , Charles Starling

Although algebraic structures are frequently analyzed using unary and binary operations, they can also be effectively defined and unified through ternary operations. In this context, we introduce structures that contain two constants and a…

Rings and Algebras · Mathematics 2024-10-31 Jorge Fatelo , Nelson Martins-Ferreira

First and second fundamental theorems are given for polynomial invariants of a class of pseudo-reflection groups (including the Weyl groups of type $B_n$), under the assumption that the order of the group is invertible in the base field.…

Representation Theory · Mathematics 2015-02-12 M. Domokos

A binary operation on any set induces a binary operation on its subsets. We explore families of subsets of a group that become a group under the induced operation and refer to such families as power groups of the given group. Our results…

We study isometric representations of the semigroup $\mathbb{Z}_+\backslash \{1\}$. Notion of an inverse representation is introduced and a complete description (up to unitary equivalence) of such representations is given. Also, we study a…

Operator Algebras · Mathematics 2013-03-05 Suren A. Grigoryan , Vardan H. Tepoyan

The main aim of this paper is to provide set-theoretical solutions of the Yang-Baxter equation that are not necessarily bijective, among these new idempotent ones. In the specific, we draw on both to the classical theory of inverse…

Quantum Algebra · Mathematics 2025-05-02 Francesco Catino , Marzia Mazzotta , Paola Stefanelli

We obtain Schur-Weyl dualities in which the algebras, acting on both sides, are semigroup algebras of various symmetric inverse semigroups and their deformations.

Representation Theory · Mathematics 2010-04-02 Ganna Kudryavtseva , Volodymyr Mazorchuk

We prove that four different notions of Morita equivalence for inverse semigroups motivated by, respectively, $C^{\ast}$-algebra theory, topos theory, semigroup theory and the theory of ordered groupoids are equivalent. We also show that…

Category Theory · Mathematics 2010-07-27 Jonathon Funk , Mark Lawson , Benjamin Steinberg

Denote by (R,.) the multiplicative semigroup of an associative algebra R over an infinite field, and let (R,*) represent R when viewed as a semigroup via the circle operation x*y=x+y+xy. In this paper we characterize the existence of an…

Rings and Algebras · Mathematics 2007-05-23 David M. Riley , Mark C. Wilson

Inverse semigroups are a class of semigroups whose structure induces a compatible partial order. This partial order is examined so as to establish mirror properties between an inverse semigroup and the semilattice of its idempotent…

Rings and Algebras · Mathematics 2013-01-25 Paul Poncet

We show that the inverse group of equivalence classes of metrics on two copies of a metric space is fundamental.

Metric Geometry · Mathematics 2025-12-18 Vladimir Manuilov

An inverse semigroup $S$ is a semigroup in which every element has a unique inverse in the sense of semigroup theory, that is, if $a \in S$ then there exists a unique $b\in S$ such that $a = aba$ and $b = bab$. We say that an inverse…

Rings and Algebras · Mathematics 2017-08-14 Thomas Quinn-Gregson

To an inverse semigroup, we associate an \'etale groupoid such that its actions on topological spaces are equivalent to actions of the inverse semigroup. Both the object and the arrow space of this groupoid are non-Hausdorff. We show that…

Dynamical Systems · Mathematics 2016-03-10 Alcides Buss , Ruy Exel , Ralf Meyer