Sean Cotner

activity

20232026

collaborators

3 papers

math.RT2026

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 $G$ as a subgroup of the fundamental group of $G$ .…

math.NT2024

Connected components of the moduli space of L-parameters

Sean Cotner

Recently, in order to formulate a categorical version of the local Langlands correspondence, several authors have constructed moduli spaces of $Z [1/ p]$ -valued L-parameters…

math.AG2023

Hom schemes for algebraic groups

Sean Cotner

In SGA3, Demazure and Grothendieck showed that if $G$ and $H$ are smooth affine group schemes over a scheme $S$ and $G$ is reductive, then the functor of $S$ -homomorphism $G \to H$ …