Centres of centralizers of unipotent elements in simple algebraic groups
Centres of centralizers of unipotent elements in simple algebraic groups
Let G be a simple algebraic group defined over an algebraically closed field k whose characteristic is either 0 or a good prime for G, and let u is an element of G be unipotent. We study the centralizer C-G(u), especially its centre Z(C-G(u)). We calculate the Lie algebra of …