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math.AG2010
On the embeddings of universal torsors over del Pezzo surfaces in the cones over flag varieties
Vladimir S. Zhgoon
Following Skorobogatov and Serganova we construct the embeddings of universal torsors over del Pezzo surfaces in the cones over flag varieties, considered as the closed orbits in t…
math.AG2010
On the Local structure theorem and equivariant geometry of cotangent bundles
Vladimir S. Zhgoon
Let be a connected reductive group acting on an irreducible normal algebraic variety . We give a slightly improved version of local structure theorems obtained by F.Knop and…