Results 31 to 40 of about 4,735 (227)

Equational theories of semigroups with involution

Journal of Algebra, 2012
The paper deals with finite basis problem for classes of partition semigroups considered as involutary semigroups. A number of interesting results are obtained. The technique relies on a subtle analysis of the structure of the semigroups under consideration as well as on the results of a previous paper by the same authors [J. Eur. Math. Soc. (JEMS) 14,
Auinger, Karl, Dolinka, Igor, Volkov, Mikhail   +2 more
openaire   +3 more sources

On disjoint unions of finitely many copies of the free monogenic semigroup

, 2013
Every semigroup which is a finite disjoint union of copies of the free monogenic semigroup (natural numbers under addition) is finitely presented and residually finite.Peer ...
Ruskuc, Nik, Abughazalah, Nabilah
core   +1 more source

Cancellative and Malcev presentations for finite Rees index subsemigroups and extensions [PDF]

, 2008
It is known that, for semigroups, the property of admitting a finite presentation is preserved on passing to subsemigroups and extensions of finite Rees index.
Cain, Alan James, Ruskuc, Nik, Robertson, Edmund Frederick   +2 more
core   +1 more source

Skew compact semigroups

Applied General Topology, 2003
Skew compact spaces are the best behaving generalization of compact Hausdorff spaces to non-Hausdorff spaces. They are those (X ; τ ) such that there is another topology τ* on X for which τ V τ* is compact and (X; τ ; τ*) is pairwise Hausdorff; under ...
Ralph D. Kopperman, Desmond Robbie
doaj   +1 more source

Every group is a maximal subgroup of the free idempotent generated semigroup over a band

, 2013
Given an arbitrary group G we construct a semigroup of idempotents (band) BG with the property that the free idempotent generated semigroup over BG has a maximal subgroup isomorphic to G. If G is finitely presented then BG is finite. This answers several
Ruskuc, Nik, Nik Ruškuc, Igor Dolinka, Dolinka, I   +3 more
core   +1 more source

Neutrosophic Bi-LA-Semigroup and Neutrosophic N-LASemigroup [PDF]

Neutrosophic Sets and Systems, 2014
In this paper we define neutrosophic bi-LA semigroup and neutrosophic N-LA-semigroup. Infact this paper is an extension of our previous paper neutrosophic left almost semigroup shortly neutrosophic LAsemigroup.
Mumtaz Ali, Florentin Smarandache, Muhammad Shabir, Munazza Naz   +3 more
doaj  

Existence and Approximate Controllability of Mild Solutions for Fractional Evolution Systems of Sobolev-Type

Fractal and Fractional, 2022
This paper investigates the existence and approximate controllability of Riemann–Liouville fractional evolution systems of Sobolev-type in abstract spaces.
Yue Liang
doaj   +1 more source

Stability of Viscous Three‐Dimensional Stratified Couette Flow via Dispersion and Mixing

Communications on Pure and Applied Mathematics, EarlyView.
ABSTRACT This article explores the stability of stratified Couette flow in the viscous 3d$3d$ Boussinesq equations. In this system, mixing effects arise from the shearing background, and gravity acts as a restoring force leading to dispersive internal gravity waves.
Michele Coti Zelati, Augusto Del Zotto, Klaus Widmayer   +2 more
wiley   +1 more source

The Cuntz semigroup and domain theory [PDF]

Soft Computing, 2017
Domain theory has its origins in Mathematics and Theoretical Computer Science. Mathematically it combines order and topology. Its central concepts have their origin in the idea of approximating ideal objects by their relatively finite or, more generally, relatively compact parts.
openaire   +2 more sources

Generating the full transformation semigroup using order preserving mappings

, 2003
For a linearly ordered set X we consider the relative rank of the semigroup of all order preserving mappings O-X on X modulo the full transformation semigroup Ex. In other words, we ask what is the smallest cardinality of a set A of mappings such that =
Higgins, PM, Mitchell, James David, Ruskuc, Nikola   +2 more
core   +1 more source