J. Michel

activity

20002005

collaborators

Showing math.GRShow all

3 papers · 1 filter

math.GR2003

Explicit presentations for exceptional braid groups

David Bessis, Jean Michel

We give presentations for the braid groups associated with the complex reflection groups $G_{24}$ and $G_{27}$ . For the cases of $G_{29}$ , $G_{31}$ , $G_{33}$ and $G_{34}$ , we give…

math.GR2002

The space of unipotently supported class functions on a finite reductive group

F. Digne, G. Lehrer, J. Michel

We determine the Lusztig restrictions on the space of class functions with a unipotent support on a finite reductive group. In particular we give a simple expression for the Luszti…

math.GR2000

Springer theory in braid groups and the Birman-Ko-Lee monoid

David Bessis, Francois Digne, Jean Michel

We state a conjecture about centralizers of certain roots of central elements in braid groups, and check it for Artin braid groups and some other cases. Our proof makes use of resu…