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Semigroup actions and their invertible extensions are discussed. First, we develop a theory of natural extensions for continuous actions of countable, embeddable semigroups. Second, we demonstrate that not every surjective such action of a…

Dynamical Systems · Mathematics 2025-07-14 Raimundo Briceño , Álvaro Bustos-Gajardo , Miguel Donoso-Echenique

We generalize the idea of a Schur ring of a group to the category of semigroups. Fundamental results of Schur rings over groups are shown to be true for Schur rings over semigroups. Examples where Schur rings differ between the two…

Group Theory · Mathematics 2026-01-16 Joseph E. Marrow , Andrew Misseldine

We provide an equivariant extension of the bivariant Cuntz semigroup introduced in previous work for the case of compact group actions over C*-algebras. Its functoriality properties are explored and some well-known classification results…

Operator Algebras · Mathematics 2016-07-11 Gabriele N. Tornetta

In this paper, we introduce the concept of complementary edge ideals of graphs and study their algebraic properties and invariants.

Commutative Algebra · Mathematics 2025-08-22 Takayuki Hibi , Ayesha Asloob Qureshi , Sara Saeedi Madani

Alan and al. defined and studied quasi-maximal ideals. We add a comprehensive characterization of these ideals, introducing submaximal ideals. The conductor of a finite minimal extension $R\subset S$ is quasi-maximal in $S$. This allows us…

Commutative Algebra · Mathematics 2026-01-21 Gabriel Picavet , Martine Picavet-L'Hermitte

We have introduced the notion of the bungee set and the filled Julia set of a transcendental semigroup using Fatou-Julia theory. Numerous results of the bungee set of a single transcendental entire function have been generalized to a…

Dynamical Systems · Mathematics 2025-10-13 Manisha Kumari , Dinesh Kumar

A characterization of an $h$-hemiregular hemiring in terms of a fuzzy $h$-ideal is provided. Some properties of prime fuzzy $h$-ideals of $h$-hemiregular hemirings are investigated. It is proved that a fuzzy subset $\zeta$ of a hemiring $S$…

Rings and Algebras · Mathematics 2007-05-23 Jianming Zhan , Wiesław A. Dudek

In this paper, we characterize intra-regular LA-semihypergroups by using the properties of their left and right hyperideals and we investigate some useful conditions for an LA-semihypergroup to become an intra-regular LA-semihypergroup.

Group Theory · Mathematics 2012-11-26 Naveed Yaqoob , Piergiulio Corsini , Faisal

In this paper, we explain the importance of finite decomposition semigroups and present two theorems related to their structure.

Combinatorics · Mathematics 2013-03-19 Matthieu Deneufchâtel , Gérard H. E. Duchamp

The aim of writing this paper is given in the title. The results on semigroups can be easily transferred to hyper-semigroups in the way indicated in the present paper.

General Mathematics · Mathematics 2016-09-06 Niovi Kehayopulu

We identify an interesting special class of prime ideals in the finitary infinite symmetric group algebra. We show that the set of such ideals carries a semiring structure. Over the complex numbers, we establish a connection with spherical…

Representation Theory · Mathematics 2026-05-18 Kevin Coulembier

We give new equations that axiomatize the variety of trimedial quasigroups. We also improve a standard characterization by showing that right semimedial, left F-quasigroups are trimedial.

Group Theory · Mathematics 2007-05-23 Michael K. Kinyon , J. D. Phillips

The aim of this paper is to propose an extension of the Wilf conjecture to semimodules over a numerical semigroup through a new approach toward the solution of the Wilf conjecture on numerical semigroups. The key point is the introduction…

Combinatorics · Mathematics 2021-06-18 Patricio Almirón , Julio José Moyano-Fernández

This work delves into the {\it quotient of an affine semigroup by a positive integer}, exploring its intricate properties and broader implications. We unveil an {\it associated tree} that serves as a valuable tool for further analysis.…

Commutative Algebra · Mathematics 2024-02-20 J. I. García-García , R. Tapia-Ramos , A. Vigneron-Tenorio

We consider the dynamics associated with an arbitrary semigroup of transcendental entire functions. Fatou-Julia theory is used to investigate the dynamics of these semigroups. Several results of the dynamics associated with iteration of a…

Dynamical Systems · Mathematics 2014-05-20 Dinesh Kumar , Sanjay Kumar

The article investigates the properties of associative ideals in monoids. Such ideals have some applications in the logic of non-standard sequences and category theory. The relations of these ideals with the verbal structure of words over…

Group Theory · Mathematics 2024-03-22 Volodymyr Zhuravlov

In this paper, we study the class of affine semigroup generated by integral vectors, whose components are in generalised arithmetic progression and we observe that the defining ideal is determinantal. We also give a sufficient condition on…

Commutative Algebra · Mathematics 2023-05-16 Joydip Saha , Indranath Sengupta , Pranjal Srivastava

In this paper we introduce the notion of m-irreducibility that extends the standard concept of irreducibility of a numerical semigroup when the multiplicity is fixed. We analyze the structure of the set of m-irreducible numerical…

Commutative Algebra · Mathematics 2010-06-18 V. Blanco , J. C. Rosales

We investigate classifications of quasitrivial semigroups defined by certain equivalence relations. The subclass of quasitrivial semigroups that preserve a given total ordering is also investigated. In the special case of finite semigroups,…

Rings and Algebras · Mathematics 2020-05-21 Jimmy Devillet , Jean-Luc Marichal , Bruno Teheux

Fuzzy ordered linear spaces, Riesz spaces, fuzzy Archimedean spaces and $\sigma$-complete fuzzy Riesz spaces were defined and studied in several works. Following the efforts along this line, we define fuzzy Riesz subspaces, fuzzy ideals,…

Functional Analysis · Mathematics 2015-03-11 Liang Hong