Results 1 to 10 of about 31 (31)
Some of the next articles are maybe not open access.
Join Irreducible 2-Testable Semigroups
Discussiones Mathematicae - General Algebra and Applications, 2021 A nontrivial pseudovariety is join irreducible if whenever it is contained in the complete join of some collection of pseudovarieties, then it is contained in one of the pseudovarieties.
Lee Edmond W.H.
doaj +1 more source
Green’s Relations on Submonoids of Generalized Hypersubstitutions of Type (n)
Discussiones Mathematicae - General Algebra and Applications, 2021 A generalized hypersubstitution of type τ = (n) is a function which takes the n-ary operation symbol f to the term of the same type σ(f ) which does not necessarily preserve the arity. Let HypG(n) be the set of all these generalized hypersubstitutions of
Kunama Pornpimol, Leeratanavalee Sorasak
doaj +1 more source
Factoriality and the Pin-Reutenauer procedure [PDF]
Discrete Mathematics & Theoretical Computer Science, 2016 We consider implicit signatures over finite semigroups determined by sets of pseudonatural numbers. We prove that, under relatively simple hypotheses on a pseudovariety V of semigroups, the finitely generated free algebra for the largest such signature ...
J. Almeida, J. C. Costa, M. Zeitoun
doaj +1 more source
On the insertion of n-powers [PDF]
Discrete Mathematics & Theoretical Computer Science, 2019 In algebraic terms, the insertion of $n$-powers in words may be modelled at the language level by considering the pseudovariety of ordered monoids defined by the inequality $1\le x^n$.
J. Almeida, O. Klíma
doaj +1 more source
An introduction of F‐graphs, a graph‐theoretic representation of natural numbers
International Journal of Mathematics and Mathematical Sciences, Volume 15, Issue 2, Page 313-317, 1992., 1990 A special type of family graphs (F‐graphs, for brevity) are introduced. These are cactus‐type graphs which form infinite families under an attachment operation. Some of the characterizing properties of F‐graphs are discussed. Also, it is shown that, together with the attachment operation, these families form an infinite, commutative semigroup with unit
E. J. Farrell
wiley +1 more source
Completely Archimedean Semirings
Discussiones Mathematicae - General Algebra and Applications, 2018 In this paper we give a structural description of completely Archimedean semirings which is an extension of the structure theorem of completely Archimedean semigroups.
Maity Sunil K., Chatterjee Rumpa
doaj +1 more source
All Maximal Completely Regular Submonoids of HypG(2)
Discussiones Mathematicae - General Algebra and Applications, 2017 In this paper we consider mappings σ which map the binary operation symbol f to the term σ (f) which do not necessarily preserve the arity. These mapping are called generalized hypersubstitutions of type τ = (2) and we denote the set of all these ...
Kunama Pornpimol, Leeratanavalee Sorasak
doaj +1 more source
On some varieties of ai-semirings satisfying xp+1 ≈ x
Open Mathematics, 2018 The aim of this paper is to study the lattice of subvarieties of the ai-semiring variety defined by the additional ...
Wang Aifa, Shao Yong
doaj +1 more source
HeliyonThe major point of proposed work is to study optimistic multi-granulation roughness of intuitionistic fuzzy ideals by using soft relations that is free from all the complications that challenged by many researchers.
Shahida Bashir +6 more
doaj +1 more source