Geodesic
Regular elements in spaces of linear representations.~II
Izvestiya. Mathematics , Tome 27 (1986) no. 2, pp. 279-284.

Voir la notice de l'article provenant de la source Math-Net.Ru

For linear actions of semisimple groups with a Cartan subspace a connection is established between the equations that define the nonregular points in the space of a representation and the equations that define the points at which the orbit morphism is not smooth. Bibliography: 6 titles. 
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D. I. Panyushev. Regular elements in spaces of linear representations.~II. Izvestiya. Mathematics , Tome 27 (1986) no. 2, pp. 279-284. http://geodesic.mathdoc.fr/item/IM2_1986_27_2_a4/

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