284 citations
- Institut FourierFR4 papers
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- Laboratoire de Mathématiques Jean LerayFR1 paper
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7 papers · 1 filter
Corrigendum to our paper: Birational transformations of weighted graphs
Hubert Flenner, Shulim Kaliman, Mikhail Zaidenberg
We give a corrected version of Corollary 3.33 in: H. Flenner, S. Kaliman, and M. Zaidenberg, Birational transformations of weighted graphs. Affine algebraic geometry. Osaka Univ. P…
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…
Uniqueness of - and -actions on Gizatullin surfaces
Hubert Flenner, Shulim Kaliman, Mikhail Zaidenberg
A Gizatullin surface is a normal affine surface over , which can be completed by a zigzag; that is, by a linear chain of smooth rational curves. In this paper we deal wi…
La singularité de O'Grady
Manfred Lehn, Christoph Sorger
Let M be the moduli space of semistable sheaves with Mukai vector 2v on an abelian or K3 surface where v is primitive such that <v,v>=2. We show that the blow-up of the reduced sin…
On the uniqueness of -actions on affine surfaces
Hubert Flenner, Mikhail Zaidenberg
We prove that a normal affine surface over admits an effective action of a maximal torus () such that any other effective -act…
Locally nilpotent derivations on affine surfaces with a $\C^*$-action
Hubert Flenner, Mikhail Zaidenberg
We give a classification of normal affine surfaces admitting an algebraic group action with an open orbit. In particular an explicit algebraic description of the affine coordinate…