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SUMMARY:Otto Overkamp (Heinrich-Heine-Universität Düsseldorf)
DTSTART:20231011T150000Z
DTEND:20231011T160000Z
DTSTAMP:20260418T070330Z
UID:LNTS/106
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/LNTS/106/">A
  proof of Chai’s conjecture</a>\nby Otto Overkamp (Heinrich-Heine-Univer
 sität Düsseldorf) as part of London number theory seminar\n\nLecture hel
 d in Room 140\, the Huxley Building\, Imperial College London.\n\nAbstract
 \nThe base change conductor is an invariant which measures the failure of 
 a semiabelian variety to have semiabelian reduction. It was conjectured by
  Chai that this invariant is additive in certain exact sequences. I shall 
 report on recent joint work with Takashi Suzuki which implies this conject
 ure. Time permitting\, I shall also discuss counterexamples to a generalis
 ation of Chai’s conjecture.\n
LOCATION:https://researchseminars.org/talk/LNTS/106/
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