Abstract
An Abelian subgroupA in a Lie groupG is said to be regular if it belongs to a connected Abelian subgroupC of the groupG (thenC is called an envelope ofA). A strict envelope is a minimal element in the set of all envelopes of the subgroupA. We prove a series of assertions on the envelopes of Abelian subgroups. It is shown that the centralizer of a subgroupA inG is transitive on connected components of the space of all strict envelopes ofA. We give an application of this result to the description of reductions of completely integrable equations on a torus to equations with constant coefficients.
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Translated fromMatematicheskie Zametki, Vol. 59, No. 2, pp. 200–210, February, 1996.
This research was partially supported by the Russian Foundation for Basic Research under grant No. 95-10123 and by the International Science Foundation under grant No. RO-4300.
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Gorbatsevich, V.V. On the envelopes of Abelian subgroups in connected Lie groups. Math Notes 59, 141–147 (1996). https://doi.org/10.1007/BF02310953
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DOI: https://doi.org/10.1007/BF02310953