Department of Mathematics


  •  Nathan Chen, Columbia University
  •  On the irrationality of some algebraic varieties and their subvarieties
  •  10/24/2022
  •  3:00 PM - 4:00 PM
  •  C304 Wells Hall
  •  Laure Flapan (

The classical question of determining which varieties are rational has led to a huge amount of interest and activity. On the other hand, one can take on a complementary perspective - given a smooth projective variety whose nonrationality is known, how far is it from being rational? I will survey what is currently known, with an emphasis on hypersurfaces and complete intersections.



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