It is proved that all maximal unipotent subgroups of a special linear group over commutative ring with identity (such that the factor ring of its modulo primitive radical is a finite direct sum of Bézout domains) are pairwise conjugated and describe one maximal unipotent subgroup of the general linear group (and of a special linear group) over an arbitrary commutative ring with identity.
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Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 71, No. 8, pp. 1150–1156, August, 2019.
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Tylyshchak, A.A. On Maximal Unipotent Subgroups of a Special Linear Group Over Commutative Ring. Ukr Math J 71, 1312–1319 (2020). https://doi.org/10.1007/s11253-019-01716-6