2 papers
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…