3 papers
math.RT2017
A new family of irreducible subgroups of the orthogonal algebraic groups
Mikaël Cavallin, Donna M. Testerman
Let and let be a simply connected, simple algebraic group of type over an algebraically closed field Also let be the subgroup of type of $Y,…
math.RT2008
Nilpotent centralizers and Springer isomorphisms
George McNinch, Donna Testerman
Let G be a semisimple algebraic group over a field K whose characteristic is very good for G, and let sigma be any G-equivariant isomorphism from the nilpotent variety to the unipo…
math.RT2005
Completely reducible SL(2)-homomorphisms
George J. McNinch, Donna M. Testerman
Let K be any field, and let G be a semisimple group over K. Suppose the characteristic of K is positive and is very good for G. We describe all group scheme homomorphisms phi:SL(2)…