Department of Mathematics


  •  David Stapleton, University of Michigan
  •  Studying the birational geometry of Fano varieties using holomorphic forms (in person!)
  •  04/06/2022
  •  4:00 PM - 5:00 PM
  •  C304 Wells Hall
  •  Laure Flapan (

One of the best invariants for studying the birational geometry of a variety is its holomorphic forms. In characteristic 0, low degree hypersurfaces (or more generally Fano varieties) do not have any holomorphic forms. For this reason, many problems about birational geometry of these varieties are quite difficult and interesting. E.g. (1) determining if the birational automorphism group is infinite or finite, (2) studying the possible rational endomorphisms of a Fano variety, and (3) understanding the rationality/nonrationality of a Fano variety. Surprisingly, Kollár showed that in characteristic p>0, there are Fano varieties that admit many global (n-1)-forms, and introduced a specialization method for using these forms in characteristic p to control the birational geometry of characteristic 0 Fano varieties. In this talk, we show how this method helps to study problems (1)-(3). This is joint work with Nathan Chen.



Department of Mathematics
Michigan State University
619 Red Cedar Road
C212 Wells Hall
East Lansing, MI 48824

Phone: (517) 353-0844
Fax: (517) 432-1562

College of Natural Science