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Orbits in real \(\mathbb Z_{m}\)-graded semisimple Lie algebras. (English) Zbl 1228.17025
A method to classify homogeneous nilpotent elements in a real \({\mathbb Z}_{m}\)-graded semisimple Lie algebra is proposed. This consists first in a classification of the conjugacy classes of characteristics (this makes use among others of work by E. B. Vinberg [Sel. Math. Sov. 6, 15–35 (1987; Zbl 0612.17010)]), and then in classifying the conjugacy classes of nilpotent elements associated with a given conjugacy class of a characteristic.
Using work of T. Oshima and T. Matsuki [J. Math. Soc. Japan 32, 399–414 (1980; Zbl 0451.53039)], this is applied to describe the set of orbits of homogeneous elements of degree \(1\) in a \({\mathbb Z}_{2}\)-graded semisimple Lie algebra, following a scheme proposed by A. G. Elashvili and Vinberg [Sel. Math. Sov. 7, No. 1, 63–98 (1988; Zbl 0648.15021)].

17B70 Graded Lie (super)algebras
15A72 Vector and tensor algebra, theory of invariants
13A50 Actions of groups on commutative rings; invariant theory
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