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Search: MSC category 14M17 ( Homogeneous spaces and generalizations [See also 32M10, 53C30, 57T15] )

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1. CJM 1998 (vol 50 pp. 929)

Broer, Abraham
Decomposition varieties in semisimple Lie algebras
The notion of decompositon class in a semisimple Lie algebra is a common generalization of nilpotent orbits and the set of regular semisimple elements. We prove that the closure of a decomposition class has many properties in common with nilpotent varieties, \eg, its normalization has rational singularities. The famous Grothendieck simultaneous resolution is related to the decomposition class of regular semisimple elements. We study the properties of the analogous commutative diagrams associated to an arbitrary decomposition class.

Categories:14L30, 14M17, 15A30, 17B45

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