Results 11 to 20 of about 504,098 (210)

Beyond Regular Semigroups [PDF]

, 2012
The topic of this thesis is the class of weakly U-abundant semigroups. This class is very wide, containing inverse, orthodox, regular, ample, adequate, quasi-adequate, concordant, abundant, restriction, Ehresmann and weakly abundant semigroups.
Wang, Yanhui
core   +6 more sources

Presentations of inverse semigroups, their kernels and extensions [PDF]

, 2011
"Part of this work was done while Gray was an EPSRC Postdoctoral Research Fellow at the University of St Andrews, Scotland"Let S be an inverse semigroup and let π:S→T be a surjective homomorphism with kernel K.
Ruskuc, Nik, Gray, Robert, Carvalho, Catarina, CATARINA CARVALHO, Gray, R, Gray, Robert D., NIK RUSKUC, ROBERT D. GRAY, Carvalho, C.A.   +8 more
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Automatic presentations for semigroups [PDF]

, 2009
Special Issue: 2nd International Conference on Language and Automata Theory and Applications (LATA 2008)This paper applies the concept of FA-presentable structures to semigroups.
Oliver, Graham, Cain, Alan James, Thomas, Richard M., Cain, Alan J., Ruskuc, Nik   +4 more
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On generalized Ehresmann semigroups

Open Mathematics, 2017
As a generalization of the class of inverse semigroups, the class of Ehresmann semigroups is introduced by Lawson and investigated by many authors extensively in the literature.
Wang Shoufeng
doaj   +1 more source

A characterization of translational hulls of a strongly right type B semigroup

Open Mathematics, 2019
The aim of this paper is to study the translational hull of a strongly right type B semigroup. Our main result is to prove that the translational hull of a strongly right type B semigroup is itself a strongly right type B semigroup. As an application, we
Li Chunhua, Xu Baogen
doaj   +1 more source

E-INVERSIVE *-SEMIGROUPS

Communications of the Korean Mathematical Society, 2012
Summary: \((S,*)\) is a semigroup \(S\) equipped with a unary operation ``\(*\)''. This work is devoted to a class of unary semigroups, namely \(E\)-inversive \(*\)-semigroups. A unary semigroup \((S,*)\) is called an \(E\)-inversive \(*\)-semigroup if the following identities hold: \(x^*xx^*=x^*\), \((x^*)^*=xx^*x\), \((xy)^*=y^*x^*\). In this paper, \
Wang, Shoufeng, Li, Yinghui
openaire   +3 more sources

On generators and presentations of semidirect products in inverse semigroups [PDF]

, 2009
In this paper we prove two main results. The first is a necessary and sufficient condition for a semidirect product of a semilattice by a group to be finitely generated.
Ruskuc, Nik, Dombi, Erzsebet Rita, Ruskuc, N, Dombi, Erzsebet   +3 more
core   +2 more sources

Brandt Extensions and Primitive Topological Inverse Semigroups

International Journal of Mathematics and Mathematical Sciences, 2010
We study (countably) compact and (absolutely) 𝐻-closed primitive topological inverse semigroups. We describe the structure of compact and countably compact primitive topological inverse semigroups and show that any countably compact primitive topological
Tetyana Berezovski, Oleg Gutik, Kateryna Pavlyk   +2 more
doaj   +1 more source

Algebras of right ample semigroups

Open Mathematics, 2018
Strict RA semigroups are common generalizations of ample semigroups and inverse semigroups. The aim of this paper is to study algebras of strict RA semigroups.
Guo Junying, Guo Xiaojiang
doaj   +1 more source

D-inverse constellations [PDF]

Categories and General Algebraic Structures with Applications
Constellations are partial algebras in the sense that they possess a partial product, and a unary operation modelling domain.  They were first used to give an ESN-style theorem for left restriction semigroups in terms of so-called inductive ...
Victoria Gould, Timothy Stokes
doaj   +1 more source