D. Testerman

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20052023

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math.GR2023

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,…

math.GR2020

Overgroups of regular unipotent elements in simple algebraic groups

Gunter Malle, Donna M. Testerman

We investigate positive-dimensional closed reductive subgroups of almost simple algebraic groups containing a regular unipotent element. Our main result states that such subgroups…

math.GR2018

Irreducible subgroups of simple algebraic groups - a survey

Timothy C. Burness, Donna M. Testerman

Let $G$ be a simple linear algebraic group over an algebraically closed field $K$ of characteristic $p ⩾ 0$ , let $H$ be a proper closed subgroup of $G$ and let $V$ be a non…