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In [[mathematics]], a '''Garside element''' is an element of an [[algebraic structure]] such as a [[monoid]] that has several desirable properties.


Formally, if ''M'' is a monoid, then an element Δ of ''M'' is said to be a '''Garside element''' if the set of all right divisors of Δ,
:<math>\{ r \in M \mid \mbox{for some } x \in M, \Delta = x r \},</math>
is the same set as the set of all left divisors of &Delta;,
:<math>\{ \ell \in M \mid \mbox{for some } x \in M, \Delta = \ell x \},</math>
and this set [[generating set|generates]] ''M''.


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A Garside element is in general not unique: any power of a Garside element is again a Garside element.
 
==Garside monoid and Garside group==
A '''Garside monoid''' is a monoid with the following properties:
* Finitely generated and atomic;
* [[Cancellative]];
* The [[Partially ordered set|partial order]] relations of divisibility are [[Lattice (order)|lattices]];
* There exists a Garside element.
 
A Garside monoid satisfies the [[Ore condition for multiplicative sets]] and hence embeds in its group of fractions: such a group is a '''Garside group'''. A Garside group is [[biautomatic group|biautomatic]] and hence has soluble [[Word problem for groups|word problem]] and [[conjugacy problem]]. Examples of such groups include [[braid group]]s and, more generally, [[Artin group]]s of [[Artin group of finite type|finite Coxeter type]].<ref name=dehorneyparis>{{citation | last1=Dehornoy | first1=Patrick | last2=Paris | first2=Luis | title=Gaussian groups and Garside groups, two generalisations of Artin groups | journal=Proceedings of the London Mathematical Society | volume=79 | number=3 | pages=569–604 | year=1999 }}</ref>
 
The name was coined by Dehornoy and Paris<ref name=dehorneyparis/> to mark the work of F. A. Garside on the conjugacy problem for braid groups.<ref>{{citation | last=Garside | first=F.A. | title=The braid group and other groups | journal=Q. J. Math., Oxf. II. Ser. | volume=20 | pages=235–254 | year=1969 }}</ref>
 
==References==
{{reflist}}
* Benson Farb, ''Problems on mapping class groups and related topics'' (Volume 74 of Proceedings of symposia in pure mathematics) AMS Bookstore, 2006, ISBN 0-8218-3838-5, p.357
* Patrick Dehornoy, "Groupes de Garside", ''Ann .Sci. Ecole Norm. Sup. (4)'' '''35''' (2002) 267-306.  [[Mathematics Reviews|MR]] 2003f:20067.
* Matthieu Picantin, "Garside monoids vs divisibility monoids", ''Math. Structures Comput. Sci.'' '''15''' (2005) 231-242. [[Mathematics Reviews|MR]] 2006d:20102.
 
[[Category:Abstract algebra]]
[[Category:Semigroup theory]]
 
 
{{Abstract-algebra-stub}}

Revision as of 20:38, 9 April 2013

In mathematics, a Garside element is an element of an algebraic structure such as a monoid that has several desirable properties.

Formally, if M is a monoid, then an element Δ of M is said to be a Garside element if the set of all right divisors of Δ,

is the same set as the set of all left divisors of Δ,

and this set generates M.

A Garside element is in general not unique: any power of a Garside element is again a Garside element.

Garside monoid and Garside group

A Garside monoid is a monoid with the following properties:

A Garside monoid satisfies the Ore condition for multiplicative sets and hence embeds in its group of fractions: such a group is a Garside group. A Garside group is biautomatic and hence has soluble word problem and conjugacy problem. Examples of such groups include braid groups and, more generally, Artin groups of finite Coxeter type.[1]

The name was coined by Dehornoy and Paris[1] to mark the work of F. A. Garside on the conjugacy problem for braid groups.[2]

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

  • Benson Farb, Problems on mapping class groups and related topics (Volume 74 of Proceedings of symposia in pure mathematics) AMS Bookstore, 2006, ISBN 0-8218-3838-5, p.357
  • Patrick Dehornoy, "Groupes de Garside", Ann .Sci. Ecole Norm. Sup. (4) 35 (2002) 267-306. MR 2003f:20067.
  • Matthieu Picantin, "Garside monoids vs divisibility monoids", Math. Structures Comput. Sci. 15 (2005) 231-242. MR 2006d:20102.


Template:Abstract-algebra-stub

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