159 citations · 323 across the 40 of their papers we have counts for
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Smooth Affine Surfaces with Non-Unique C*-Actions
Hubert Flenner, Shulim Kaliman, Mikhail Zaidenberg
In this paper we complete the classification of effective C*-actions on smooth affine surfaces up to conjugation in the full automorphism group and up to inversion of C*. If a smoo…
Embeddings of C*-surfaces into weighted projective spaces
Hubert Flenner, Shulim Kaliman, Mikhail Zaidenberg
Let V be a normal affine surface which admits a C*- and a C+-action. In this note we show that in many cases V can be embedded as a principal Zariski open subset into a hypersurfac…
On the Danilov-Gizatullin Isomorphism Theorem
Hubert Flenner, Shulim Kaliman, Mikhail Zaidenberg
A Danilov-Gizatullin surface is a normal affine surface V, which is a complement to an ample section S in a Hirzebruch surface of index d. By a surprising result due to Danilov and…
Algebraic density property of homogeneous spaces
Fabrizio Donzelli, Alexander Dvorsky, Shulim Kaliman
Let be an affine algebraic variety with a transitive action of the algebraic automorphism group. Suppose that is equipped with several non-degenerate fixed point free $SL_2…