Geodesic
Kronecker indices of the Lie algebra and an estimate for the degrees of invariants
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2011), pp. 26-30

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The notion of Kronecker indices of a Lie algebra as integers naturally connected to its structure tensor is introduced. A lower bound for the degrees of polynomial invariants of the coadjoint action in terms of Kronecker indices is proved. 
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     author = {A. S. Vorontsov},
     title = {Kronecker indices of the {Lie} algebra and an estimate for the degrees of invariants},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
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A. S. Vorontsov. Kronecker indices of the Lie algebra and an estimate for the degrees of invariants. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2011), pp. 26-30. http://geodesic.mathdoc.fr/item/VMUMM_2011_1_a4/