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SUMMARY:Davide Cesare Veniani (Stuttgart)
DTSTART:20221125T124000Z
DTEND:20221125T134000Z
DTSTAMP:20260423T035818Z
UID:OBAGS/15
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/OBAGS/15/">N
 on-degeneracy of Enriques surfaces</a>\nby Davide Cesare Veniani (Stuttgar
 t) as part of ODTU-Bilkent Algebraic Geometry Seminars\n\n\nAbstract\nEnri
 ques' original construction of Enriques surfaces involves a 10-dimensional
  family of sextic surfaces in the projective space which are non-normal al
 ong the edges of a tetrahedron. The question whether all Enriques surfaces
  arise through Enriques' construction has remained open for more than a ce
 ntury.\n\nIn two joint works with G. Martin (Bonn) and G. Mezzedimi (Hanno
 ver)\, we have now settled this question in all characteristics by studyin
 g particular configurations of genus one fibrations\, and two invariants c
 alled maximal and minimal non-degeneracy. The proof involves so-called `tr
 iangle graphs' and the distinction between special and non-special 3-seque
 nces of half-fibers.\n\nIn this talk\, I will present the problem and expl
 ain its solution\, illustrating further possible developments and applicat
 ions.\n
LOCATION:https://researchseminars.org/talk/OBAGS/15/
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