18 citations · 22 across the 17 of their papers we have counts for
21 papers
Epimorphic subgroups of simple algebraic groups
Donna M. Testerman, Adam R. Thomas
A morphism of linear algebraic groups is called an epimorphism if it admits right cancellation. A subgroup is epimorphic if the inclusion map is an epi…
Roger Carter
Meinolf Geck, Donna M. Testerman
Roger Carter (1934--2022) was a very well known mathematician working in algebra, representation theory and Lie theory. He spent most of his mathematical career in Warwick. Roger w…
Multiplicity-free representations of the principal A1-subgroup in a simple algebraic group
Aluna Rizzoli, Donna Testerman
Let G be a simple algebraic group defined over an algebraically closed field k of characteristic p>0. Here we classify all irreducible kG-modules for which the principal A1 has no…
Unicity of A1-subgroups associated to unipotent elements in simple algebraic groups
Rachel Pengelly, Donna M. Testerman
Let k be an algebraically closed field of positive characteristic and G a simple algebraic group defined over k. Under the assumption that the characteristic is a good prime for G,…
Multiplicity-free representations of algebraic groups II
Martin W. Liebeck, Gary M. Seitz, Donna M. Testerman
We continue our work (started in ``Multiplicity-free representations of algebraic groups", arXiv:2101.04476), on the program of classifying triples , where are simpl…
On minimal epimorphic subgroups in simple algebraic groups of rank
Iulian I. Simion, Donna M. Testerman
The category of linear algebraic groups admits non-surjective epimorphisms. For simple algebraic groups of rank defined over algebraically closed fields, we show that the minim…