Sean Cotner

activity

20222026

most citedHom schemes for algebraic groups

2 citations · 4 across the 8 of their papers we have counts for

collaborators

Showing math.RTShow all

3 papers · 1 filter

math.RT2026

Base change and the Mackey formula in Deligne--Lusztig theory

Sean Cotner

Using ideas of Digne and recent work of Gaitsgory--Rozenblyum--Varshavsky, we show that Lusztig induction commutes with (a minor variant of) the Glauberman correspondence for large…

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.RT2023

Morphisms of character varieties

Sean Cotner

Let $k$ be a field, let $H \subset G$ be (possibly disconnected) reductive groups over $k$ , and let $Γ$ be a finitely generated group. Vinberg and Martin have shown that the induce…