Birational rigidity of del Pezzo fibrations with quotient singularities and its application

Abstract

In this paper we give a criterion for birational rigidity of del Pezzo fibrations of degree 1 and 2 with only quotient singularities. As an application, we prove birational rigidity of suitable del Pezzo fibrations admitting an action of the Klein simple group.

arXiv commentThis paper has been withdrawn due to a gap in the proof of Proposition 2.19