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Symplectic slices for actions of reductive groups
Sbornik. Mathematics, Tome 197 (2006) no. 2, pp. 213-224 Cet article a éte moissonné depuis la source Math-Net.Ru

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Let $G$ be a reductive algebraic group over the field $\mathbb C$, $X$ a symplectic smooth affine algebraic variety, $G:X$ a Hamiltonian action, $x$ a point in $X$ with closed orbit. The structure of the variety $X$ in some invariant neighbourhood of the point $x$ is described. The neighbourhood is taken in the complex topology. Bibliography: 6 titles. 
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I. V. Losev. Symplectic slices for actions of reductive groups. Sbornik. Mathematics, Tome 197 (2006) no. 2, pp. 213-224. http://geodesic.mathdoc.fr/item/SM_2006_197_2_a4/

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