Results 1 to 10 of about 1,200 (220)

Pre-strongly solid varieties of commutative semigroups

, 2011
Generalized hypersubstitutions are mappings from the set of all fundamental operations into the set of all terms of the same language do not necessarily preserve the arities.
Phuapong, Sarawut, Leeratanavalee, Sorasak   +1 more
core   +1 more source

On Weakly Commutative Ordered Semigroups

Semigroup Forum, 1998
A partially ordered semigroup \((S, \cdot, \leq)\) is ``weakly commutative'' if for all \(a,b \in S\) there exist \(x\in S\) and a nonnegative integer \(n\) such that \((ab)^n \leq bxa\). It is ``archimedean'' if for all \(a,b\in S\) there exist \(x,y\in S\) and \(m\) such that \(a^m\leq xby\). It was shown by \textit{N.
Kehayopulu, N, Tsingelis, M
openaire   +2 more sources

Classification and enumeration of finite semigroups

, 2010
The classification of finite semigroups is difficult even for small orders because of their large number. Most finite semigroups are nilpotent of nilpotency rank 3.
Distler, Andreas
core  

The varieties of commutative semigroups for which epis are onto

, 1983
SynopsisIn a forthcoming paper, N. M. Khan gives a condition for a variety of commutative semigroups V to be saturated in the sense of Howie and Isbell (1967) (i.e. epis are onto for each S ∈ V).
P. M. Higgins
core   +1 more source

Equations on Semidirect Products of Commutative Semigroups [PDF]

, 1997
In this paper; we study equations on semidirect products of commutative semigroups. Let Comq,r denote the pseudovariety of all finite semigroups that satisfy the equations xy = yx and xr + q = xr.
Blanchet-Sadri, Francine, NC DOCKS at The University of North Carolina at Greensboro   +1 more
core  

Smarandache Semigroups [PDF]

, 2002
The main motivation and desire for writing this book, is the direct appreciation and attraction towards the Smarandache notions in general and Smarandache algebraic structures in particular.
Vasantha, Kandasamy
core   +1 more source

Commutative Semigroups Which Are Semigroup Amalgamation Bases

Journal of Algebra, 2001
A semigroup amalgam \([\{T_k\}_{i\in I};S]\) is an indexed family of semigroups \(T_i\) containing a semigroup \(S\) such that \(T_i\cap T_j=S\) for all distinct \(i,j\in I\). A semigroup \(S\) is called a semigroup amalgamation base (simply, amalgamation base) if any semigroup amalgam \([\{T_i\}_{i\in I};S]\) is embedded into a semigroup. A semigroup \
openaire   +2 more sources

φ−Hilfer Fractional Cauchy Problems with Almost Sectorial and Lie Bracket Operators in Banach Algebras

Fractal and Fractional
In the theory of Banach algebras, we use the Schauder fixed-point theorem to obtain some results that concern the existence property for mild solutions of fractional Cauchy problems that involve the Lie bracket operator, the almost sectorial operator ...
Faten H. Damag, Amin Saif, Adem Kiliçman   +2 more
doaj   +1 more source

H-commutative Delta-semigroups

, 1995
. A \Delta\Gammasemigroup is a semigroup whose lattice of congruences is a chain with respect to inclusion. Schein [9] and Tamura [11] have investigated commutative \Delta\Gammasemigroups, Trotter [13] exponential, Nagy [4] weakly exponential and Bonzini
Reinhard Strecker
core  

Regular, Commutative, Maximal Semigroups of Quotients

, 1975
A well-known theorem which goes back to R. E. Johnson [4], asserts that if R is a ring then Q(R), its maximal ring of quotients is regular (in the sense of v. Neumann) if and only if the singular ideal of R vanishes. In the theory of semigroups a natural
Jurgen Rompke
core   +1 more source