2 papers
math.GR2026
Centralisers of semi-simple elements are semidirect products
François Digne, Jean Michel
Let $\bG$ be a connected reductive algebraic group over an algebraically closed field, and let $s\in\bG$ be a semisimple element. We show that the centraliser of is the semidir…
math.GR2024
Retraction to a parabolic subgroup and applications
François Digne, Eddy Godelle, Jean Michel
We continue the study of the retraction from an Artin group to a standard parabolic subgroup introduced by Blufstein, Charney, Paris and the second author. Using right and left ret…