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Towards a geometric theory for left loops

Karla Baez (2014)

Commentationes Mathematicae Universitatis Carolinae

In [Mwambene E., Multiples of left loops and vertex-transitive graphs, Cent. Eur. J. Math. 3 (2005), no. 2, 254–250] it was proved that every vertex-transitive graph is the Cayley graph of a left loop with respect to a quasi-associative Cayley set. We use this result to show that Cayley graphs of left loops with respect to such sets have some properties in common with Cayley graphs of groups which can be used to study a geometric theory for left loops in analogy to that for groups.

Towards parametrizing word equations

H. Abdulrab, P. Goralčík, G. S. Makanin (2001)

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications

Classically, in order to resolve an equation u v over a free monoid X * , we reduce it by a suitable family of substitutions to a family of equations u f v f , f , each involving less variables than u v , and then combine solutions of u f v f into solutions of u v . The problem is to get in a handy parametrized form. The method we propose consists in parametrizing the path traces in the so called graph of prime equations associated to u v . We carry out such a parametrization in the case the prime equations in the graph...

Towards parametrizing word equations

H. Abdulrab, P. Goralčík, G. S. Makanin (2010)

RAIRO - Theoretical Informatics and Applications

Classically, in order to resolve an equation u ≈ v over a free monoid X*, we reduce it by a suitable family of substitutions to a family of equations uf ≈ vf, f , each involving less variables than u ≈ v, and then combine solutions of uf ≈ vf into solutions of u ≈ v. The problem is to get in a handy parametrized form. The method we propose consists in parametrizing the path traces in the so called graph of prime equations associated to u ≈ v. We carry out such a parametrization in the case the...

Trace functions on Iwahori-Hecke algebras

Meinolf Geck (1998)

Banach Center Publications

This paper is an expanded version of a talk given at the Banach Center Symposium on Knot Theory in July/August 1995. Its aim is to provide a general survey about trace functions on Iwahori-Hecke algebras associated with finite Coxeter groups. The so-called Markov traces are relevant to knot theory as they can be used to construct invariants of oriented knots and links. We present a classification of Markov traces for the classical types A, B and D.

Traces, lengths, axes and commensurability

Alan W. Reid (2014)

Annales de la faculté des sciences de Toulouse Mathématiques

The focus of this paper are questions related to how various geometric and analytical properties of hyperbolic 3-manifolds determine the commensurability class of such manifolds. The paper is for the large part a survey of recent work.

Transformation de Poisson sur un arbre localement fini

Ferdaous Kellil, Guy Rousseau (2005)

Annales mathématiques Blaise Pascal

Dans cet article on étudie en premier lieu la résolvante (le noyau de Green) d’un opérateur agissant sur un arbre localement fini. Ce noyau est supposé invariant par un groupe G d’automorphismes de l’arbre. On donne l’expression générique de cette résolvante et on établit des simplifications sous différentes hypothèses sur G .En second lieu on introduit la transformation de Poisson qui associe à une mesure additive finie sur l’espace Ω des bouts de l’arbre une fonction propre de l’ opérateur. On...

Transformation semigroups associated to Γ-semigroups

Dariush Heidari, Marzieh Amooshahi (2013)

Discussiones Mathematicae - General Algebra and Applications

The concept of Γ-semigroups is a generalization of semigroups. In this paper, we associate two transformation semigroups to a Γ-semigroup and we call them the left and right transformation semigroups. We prove some relationships between the ideals of a Γ-semigroup and the ideals of its left and right transformation semigroups. Finally, we study some relationships between Green's equivalence relations of a Γ-semigroup and its left (right) transformation semigroup.

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