2 citations · 4 across the 3 of their papers we have counts for
4 papers
Springer isomorphisms over a general base scheme
Sean Cotner
We establish the existence of Springer isomorphisms for reductive group schemes over general base schemes. For this, we first study centralizers of fiberwise regular sections of re…
Centralizers of sections of a reductive group scheme
Sean Cotner
This paper proves a number of flatness results for centralizers of sections of a reductive group scheme over a general base scheme. To this end, we establish relative versions of t…
Central isogenies and conjugacy classes in reductive groups
Sean Cotner
Steinberg described the group of components of the centralizer of a semisimple element of a connected semisimple algebraic group as a subgroup of the fundamental group of .…
Hom schemes for algebraic groups
Sean Cotner
In SGA3, Demazure and Grothendieck showed that if and are smooth affine group schemes over a scheme and is reductive, then the functor of -homomorphism …