Results 1 to 10 of about 2,517 (95)

On Naturally Ordered Abundant Semigroups with an Adequate Monoid Transversal

open access: goldDiscrete Dynamics in Nature and Society, 2019
In this paper, we study a class of naturally ordered abundant semigroups with an adequate monoid transversal, namely, naturally ordered concordant semigroups with an adequate monoid transversal.
Wei Chen
openalex   +2 more sources

Finite basis problems for stalactic, taiga, sylvester and baxter monoids [PDF]

open access: yesJournal of Algebra and its Applications, 2021
Stalactic, taiga, sylvester and Baxter monoids arise from the combinatorics of tableaux by identifying words over a fixed ordered alphabet whenever they produce the same tableau via some insertion algorithm.
B. Han, Wen Ting Zhang
semanticscholar   +1 more source

On (2; 2)-regular Non-associative Ordered Semigroups via Its Semilattices and Generated (Generalized Fuzzy) Ideals

open access: yes, 2020
The main motivation behind this paper is to study some structural properties of a non-associative structure as it hasn't attracted much attention compared to associative structures. In this paper, we introduce the concept of an ordered A*G**-groupoid and
Yousef Al-Qudah   +3 more
semanticscholar   +1 more source

The omega-inequality problem for concatenation hierarchies of star-free languages [PDF]

open access: yes, 2017
The problem considered in this paper is whether an inequality of omega-terms is valid in a given level of a concatenation hierarchy of star-free languages.
Almeida, J., Klíma, O., Kunc, M.
core   +2 more sources

Schreier split extensions of preordered monoids [PDF]

open access: yes, 2020
Properties of preordered monoids are investigated and important subclasses of such structures are studied. The corresponding full subcategories of the category of preordered monoids are functorially related between them as well as with the categories of ...
Martins-Ferreira, Nelson   +1 more
core   +2 more sources

Eilenberg Theorems for Free [PDF]

open access: yes, 2017
Eilenberg-type correspondences, relating varieties of languages (e.g. of finite words, infinite words, or trees) to pseudovarieties of finite algebras, form the backbone of algebraic language theory.
Adámek, Jiří   +3 more
core   +2 more sources

Identities in the Algebra of Partial Maps [PDF]

open access: yes, 2006
We consider the identities of a variety of semigroup-related algebras modelling the algebra of partial maps. We show that the identities are intimately related to a weak semigroup deductive system and we show that the equational theory is decidable.
Jackson, Marcel, Stokes, Tim E.
core   +2 more sources

Monoids with tests and the algebra of possibly non-halting programs [PDF]

open access: yes, 2014
We study the algebraic theory of computable functions, which can be viewed as arising from possibly non-halting computer programs or algorithms, acting on some state space, equipped with operations of composition, if-then-else and while-do defined in ...
Jackson, Marcel, Stokes, Tim E.
core   +4 more sources

The Finite Basis Problem for Kiselman Monoids [PDF]

open access: yes, 2015
In an earlier paper, the second-named author has described the identities holding in the so-called Catalan monoids. Here we extend this description to a certain family of Hecke--Kiselman monoids including the Kiselman monoids $\mathcal{K}_n$.
Ashikhmin, D. N.   +2 more
core   +2 more sources

Completions of monoids with applications to the Cuntz semigroup [PDF]

open access: yes, 2010
We provide an abstract categorical framework that relates the Cuntz semigroups of the C$^*$-algebras $A$ and $A\otimes \mathcal{K}$. This is done through a certain completion of ordered monoids by adding suprema of countable ascending sequences.
Ramon Antoine, J. Bosa, F. Perera
semanticscholar   +1 more source

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