Results 41 to 50 of about 543 (107)
Further results on monoids acting on trees
, 2011 This paper further develops the theory of arbitrary semigroups acting on trees via elliptic mappings. A key tool is the Lyndon-Chiswell length function L for the semigroup S which allows one to construct a tree T and an action of S on T via elliptic maps.
Rhodes, John, Silva, Pedro V.
core +1 more source
, 2015 We solve the word problem for the free objects in the variety consisting of bands with a semilattice transversal.
Albert, Justin, Pastijn, Francis
core +1 more source
Unit-regular orthodox semigroups [PDF]
Glasgow Mathematical Journal, 1984 Unit-regular rings were introduced by Ehrlich [4]. They arose in the search for conditions on a regular ring that are weaker than the ACC, DCC, or finite Goldie dimension, which with von Neumann regularity imply semisimplicity. An account of unit-regular rings, together with a good bibliography, is given by Goodearl [5].
openaire +2 more sources
Quivers of monoids with basic algebras
, 2011 We compute the quiver of any monoid that has a basic algebra over an algebraically closed field of characteristic zero. More generally, we reduce the computation of the quiver over a splitting field of a class of monoids that we term rectangular monoids (
Aguiar +27 more
core +1 more source
The isomorphism problem for orthodox semigroups [PDF]
Pacific Journal of Mathematics, 1989 The author's structure theorem for orthodox semigroups [ibid. 39, 677-686 (1971; Zbl 0232.20124)] produced an orthodox semigroup \({\mathcal H}(E,T,\psi)\) from a band \(E\), an inverse semigroup \(T\) and a morphism \(\psi\) between two inverse semigroups, namely \(T\) and \(W_ E/\gamma\), an inverse semigroup constructed from \(E\).
openaire +3 more sources
Semigroups whose idempotents form a subsemigroup [PDF]
, 1992 We prove that every semigroup S in which the idempotents form a subsemigroup has an E-unitary cover with the same property. Furthermore, if S is E-dense or orthodox, then its cover can be chosen with the same property. Then we describe the structure of E-
Almeida, Jorge +2 more
core +1 more source
Some Classes Of Semigroups That Have Medial Idempotent And Some Construction Theorem [PDF]
, 2013 It's known that the set of idempotents of the semigroup, plays an important role forthe structure of this semigroup. Specially, in the regular semigroups, an importantrole plays presence of the medial idempotent and normal medial idempotent.Blyth,T.
Edmond Pİ, Osman HYSA
core
, 2001 The stochastic methods in Hilbert space have been used both from a fundamental and a practical point of view. The result we report here concerns only the idea of applying these methods to model the evolution of quantum systems and does not enter into the
Salgado, D., Sanchez-Gomez, J. L.
core +1 more source
Orthodox semigroups and permutation matchings [PDF]
Semigroup Forum, 2016 We determine when an orthodox semigroup S has a permutation that sends each member of S to one of its inverses and show that if such a permutation exists, it may be taken to be an involution. In the case of a finite orthodox semigroup the condition is an effective one involving Green's relations on the combinatorial images of the principal factors of S.
openaire +3 more sources
Ash's type II theorem, profinite topology and Malcev products [PDF]
, 1991 This paper is concerned with the many deep and far reaching consequences of Ash's positive solution of the type II conjecture for finite monoids. After rewieving the statement and history of the problem, we show how it can be used to decide if a finite ...
Henckell, Karsten +3 more
core +1 more source