Overgroups of exterior powers of an elementary group. Normalizers
Roman Lubkov
Saint Petersburg University, St. Petersburg, RussiaIlia Nekrasov
University of Michigan, Ann Arbor, USA
Abstract
We establish two characterizations of an algebraic group scheme over . Geometrically, the scheme is a stabilizer of an explicitly given invariant form or, generally, an invariant ideal of forms. Algebraically, is isomorphic (as a scheme over ) to a normalizer of the elementary subgroup functor and a normalizer of the subscheme .
Our immediate goal is to apply both descriptions in the “sandwich classification” of overgroups of the elementary subgroup. Additionally, the results can be seen as a solution of the linear preserver problem for algebraic group schemes over , providing a more functorial description that goes beyond geometry of the classical case over fields.
Cite this article
Roman Lubkov, Ilia Nekrasov, Overgroups of exterior powers of an elementary group. Normalizers. Doc. Math. 29 (2024), no. 5, pp. 1243–1268
DOI 10.4171/DM/956