On abstract homomorphisms of some special unitary groups

2021/07/15 by Rapinchuk, Igor A., Ruiter, Joshua · 1 citation
#Algebraic Geometry (math.AG) #FOS: Mathematics #Group Theory (math.GR) #Representation Theory (math.RT)

paper · doi:10.48550/arxiv.2107.07351

Abstract

We analyze the abstract representations of the groups of rational points of even-dimensional quasi-split special unitary groups associated with quadratic field extensions. We show that, under certain assumptions, such representations have a standard description, as predicted by a conjecture of Borel and Tits. Our method extends the approach introduced by the first author to study abstract representations of Chevalley groups and is based on the construction and analysis of a certain algebraic ring associated to a given abstract representation.

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• Abstract isomorphisms of isotropic root graded groups over rings

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