- journal article metadata
European Mathematical Society Publishing House
2016-09-19 17:04:57
Groups, Geometry, and Dynamics
Groups Geom. Dyn.
GGD
1661-7207
1661-7215
Group theory and generalizations
10.4171/GGD
http://www.ems-ph.org/doi/10.4171/GGD
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European Mathematical Society Publishing House
Zuerich, Switzerland
© European Mathematical Society
1
2007
2
Représentation par des transvections des groupes d'Artin–Tits
Eddy
Godelle
Université de Caen, CAEN CEDEX, FRANCE
Representation of braid groups, automorphisms of free groups, episturmian morphisms
In a recent article, C. Kassel and C. Reutenauer studied the connection between the 4 strand braid group and Sturmian morphisms in word combinatorics. The aim of the current work is to extend this approach into a general connection between braid groups (of any index) and episturmian morphisms, a natural generalization of sturmian morphisms. Our key tool consists in associating with every graph a certain finite family of automorphisms of a free group. In the case of a complete graph, we recover some well-known family of episturmian morphisms. Now, considering the path of length n, we deduce a seemingly new representation of the braid group Bn +1 in Aut(Fn). By considering some other graphs, we similarly obtain representations of various Artin–Tits groups, in particular some affine braid groups. Our representation is faithful for B3 and B4; for other cases, the question of faithfulness remains open.
Group theory and generalizations
Computer science
General
111
133
10.4171/GGD/7
http://www.ems-ph.org/doi/10.4171/GGD/7