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DTSTART:20070311T020000
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DTSTAMP:20250924T133129
DTSTART;TZID=America/Detroit:20251008T153000
DTEND;TZID=America/Detroit:20251008T170000
SUMMARY:Workshop / Seminar:Algebraic Geometry Seminar: Shioda's conjecture on unirationality
DESCRIPTION:In characteristic zero\, Castelnuovo proved that a unirational surface is rational. In positive characteristic\, this fails. We discuss the plethora of non-rational\, often general-type\, surfaces that are unirational in positive characteristic. In 1977\, Shioda conjectured that these surfaces are classified by a cohomological property: supersingularity. I will demonstrate a counterexample to this conjecture. We will need a new obstruction that uses ideas from the study of hyperbolicity.
UID:137073-21879476@events.umich.edu
URL:https://events.umich.edu/event/137073
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4096
CONTACT:
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