Results 11 to 20 of about 206 (53)

The Efficiency of the Semi-Direct Products of Free Abelian Monoid with Rank n by the Infinite Cyclic Monoid [PDF]

open access: yes, 2011
In this paper we give necessary and sufficient conditions for the efficiency of the semi-direct product of free abelian monoid with rank n by the infinite cyclic ...
Ateş, Fırat   +2 more
core   +1 more source

Monoids over which all weakly flat acts are flat [PDF]

open access: yes, 1990
If R is a ring with identity and M is a left R-module then it is well known that the following statements are equivalent: (1) M is flat. (2) The functor—⊗ M preserves embeddings of right ideals into R.
Bulman-Fleming, Sydney   +1 more
core   +2 more sources

Covers of acts over monoids II [PDF]

open access: yes, 2012
In 1981 Edgar Enochs conjectured that every module has a flat cover and finally proved this in 2001. Since then a great deal of effort has been spent on studying different types of covers, for example injective and torsion free covers.
A.H. Clifford   +17 more
core   +1 more source

Cross-connections and variants of the full transformation semigroup [PDF]

open access: yes, 2017
Cross-connection theory propounded by K. S. S. Nambooripad describes the ideal structure of a regular semigroup using the categories of principal left (right) ideals.
Muhammed, P. A. Azeef
core   +1 more source

The algebra of rewriting for presentations of inverse monoids [PDF]

open access: yes, 2019
We describe a formalism, using groupoids, for the study of rewriting for presentations of inverse monoids, that is based on the Squier complex construction for monoid presentations.
Gilbert, N. D., McDougall, E. A.
core   +2 more sources

Permutation of elements in double semigroups [PDF]

open access: yes, 2015
Double semigroups have two associative operations $\circ, \bullet$ related by the interchange relation: $( a \bullet b ) \circ ( c \bullet d ) \equiv ( a \circ c ) \bullet ( b \circ d )$. Kock \cite{Kock2007} (2007) discovered a commutativity property in
Bremner, Murray, Madariaga, Sara
core   +1 more source

On homological classification of pomonoids by GP-po-flatness of S-posets

open access: yesOpen Mathematics, 2016
In this paper, we introduce GP-po-flatness property of S-posets over a pomonoid S, which lies strictly between principal weak po-flatness and po-torsion freeness.
Liang Xingliang   +2 more
doaj   +1 more source

A correspondence between a class of monoids and self-similar group actions II [PDF]

open access: yes, 2014
The first author showed in a previous paper that there is a correspondence between self-similar group actions and a class of left cancellative monoids called left Rees monoids.
Lawson, Mark V., Wallis, Alistair R.
core   +2 more sources

Cross-connections of the singular transformation semigroup [PDF]

open access: yes, 2017
Cross-connection is a construction of regular semigroups using certain categories called normal categories which are abstractions of the partially ordered sets of principal left (right) ideals of a semigroup.
Muhammed, P. A. Azeef, Rajan, A. R.
core   +1 more source

On finite complete presentations and exact decompositions of semigroups [PDF]

open access: yes, 2011
We prove that given a finite (zero) exact right decomposition (M, T) of a semigroup S, if M is defined by a finite complete presentation, then S is also defined by a finite complete presentation.
Araújo, João, Malheiro, António
core   +1 more source

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