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SUMMARY:Lena Ji (Princeton/Michigan)
DTSTART:20210611T190000Z
DTEND:20210611T200000Z
DTSTAMP:20260407T214656Z
UID:agstanford/53
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/agstanford/5
 3/">The Noether–Lefschetz theorem</a>\nby Lena Ji (Princeton/Michigan) a
 s part of Stanford algebraic geometry seminar\n\n\nAbstract\nThe classical
  Noether–Lefschetz theorem says that for a very general surface $S$ of d
 egree $ \\geq 4$ in $\\mathbf{P}^3$ over the complex numbers\, the restric
 tion map from the divisor class group on $\\mathbf{P}^3$ to $S$ is an isom
 orphism. In this talk\, we give an elementary proof of Noether–Lefschetz
 . We do not use any Hodge theory\, cohomology\, or monodromy. This argumen
 t has the additional advantage that it works over fields of arbitrary char
 acteristic and for singular varieties (for Weil divisors).\n\nThe synchron
 ous discussion for Lena Ji’s talk is taking place not in zoom-chat\, but
  at https://tinyurl.com/2021-06-11-lj  (and will be deleted after ~3-7 day
 s).\n
LOCATION:https://researchseminars.org/talk/agstanford/53/
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