Flexible bundles over rigid affine surfaces

  • Adrien Dubouloz

    Université de Bourgogne, Dijon, France


We construct a smooth rational affine surface with finite automorphism group but with the property that the group of automorphisms of the cylinder acts infinitely transitively on the complement of a closed subset of codimension at least two. Such a surface is in particular rigid but not stably rigid with respect to the Makar–Limanov invariant.

Cite this article

Adrien Dubouloz, Flexible bundles over rigid affine surfaces. Comment. Math. Helv. 90 (2015), no. 1, pp. 121–137

DOI 10.4171/CMH/348