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SUMMARY:Lena Ji (Michigan)
DTSTART:20211024T190000Z
DTEND:20211024T192000Z
DTSTAMP:20260423T005658Z
UID:AGNES/15
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/AGNES/15/">T
 he Noether–Lefschetz theorem in arbitrary characteristic</a>\nby Lena Ji
  (Michigan) as part of Algebraic Geometry NorthEastern Series (AGNES)\n\n\
 nAbstract\nThe classical Noether–Lefschetz theorem says that for a very 
 general surface S of degree 4 in P^3 over the complex numbers\, the restri
 ction map from the divisor class group on P^3 to S is an isomorphism. In t
 his talk\, we will show a Noether–Lefschetz result for varieties over fi
 elds of arbitrary characteristic. The proof uses the relative Jacobian of 
 a curve fibration\, and it also works for singular varieties (for Weil div
 isors).\n
LOCATION:https://researchseminars.org/talk/AGNES/15/
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