Results 21 to 30 of about 109 (62)
International Journal of Mathematics and Mathematical Sciences, Volume 20, Issue 4, Page 803-811, 1997., 1997 A comultiplication on a monoid S is a homomorphism m : S → S∗S (the free product of S with itself) whose composition with each projection is the identity homomorphism. We investigate how the existence of a comultiplication on S restricts the structure of S.
Martin Arkowitz, Mauricio Gutierrez
wiley +1 more source
Sequence generator of two second homotopy modules
, 2015 This article discusses about sequence generators of two second homotopy modules. We consider group presentation 〈y, z ; y, z〉 and 〈b, c; b, (bc)〉. It’s shown that 〈y, z ; y, z〉 and 〈b, c; b, (bc)〉 are isomorphic, and there are sequence of generators from
Yanita
semanticscholar +1 more source
, 2013 In this paper we define a new monoid construction under crossed products for given monoids. We also present a generating set and a relator set for this product. Finally, we give the necessary and sufficient conditions for the regularity of it. MSC: 05C10,
Cangül, İ. N. +3 more
core +1 more source
On finite presentability of direct products of semigroups
, 2000 A finite semigroup S is said to preserve finite generation (resp., presentability) in direct products, provided that, for every infinite semigroup T, the direct product S x T is finitely generated (resp., finitely presented) if and only if T is finitely ...
Ruskuc, Nikola, Araujo, IM
core +2 more sources
Computing generators of second homotopy module using Tietze transformation methods
, 2013 This paper discusses the relationship of second homotopy module for two different presentations defining a similar group. These two presentations can be transformed to each other using Tietze transformation.
Yanita, A. Ahmad
semanticscholar +1 more source
Two-sided homological properties of special and one-relator monoids
Forum of Mathematics, SigmaA monoid presentation is called special if the right-hand side of each defining relation is equal to 1. We prove results which relate the two-sided homological finiteness properties of a monoid defined by a special presentation with those of its group of
Robert D. Gray, Benjamin Steinberg
doaj +1 more source
On finite generations and presentability of Schützenberger products
, 2020 The finite generation and presentation of Schützenberger products of semigroups are investigated. A general necessary and sufficient condition is established for finite generation.
Peter Gallagher, Nik Ruškuc
core
On the Decidability of Iterated Semidirect Products with Applications to Complexity
, 2000 The notion of hyperdecidability has been introduced by the first author as a tool to prove decidability of semidirect products of pseudovarieties of semigroups.
J. Almeida, B. Steinberg
semanticscholar +1 more source
Collision-free motions of round robots on metric graphs [PDF]
, 2013 In this thesis, we study the path-connectivity problem of configuration spaces of two robots that move without collisions on a connected metric graph. The robots are modelled as metric balls of positive radii.
SAFI-SAMGHABADI, MARJAN
core
An algebraic model for inversion and deletion in bacterial genome rearrangement. [PDF]
J Math Biol, 2023 Clark C +3 more
europepmc +1 more source