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Unicity of A1-subgroups associated to unipotent elements in simple algebraic groups (2311.12512v1)

Published 21 Nov 2023 in math.GR

Abstract: 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, we determine a maximal G-stable subvariety U' of the variety of unipotent elements of G such that for all u in U' any two A1-subgroups of G containing u are G-conjugate. This result establishes to what degree an analogue of the Jacobson-Morozov theorem for Lie algebras is valid for simple algebraic groups defined over fields of (good) positive characteristic

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