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DTSTAMP:20190821T155037Z
UID:20190821T135037-01676900570@www.mn.uio.no
DTSTART:20190430T121500Z
DTEND:20190430T140000Z
DESCRIPTION:Unlike most cohomology theories in algebraic geometry, algebraic K-theory does not satisfy descent with respect to arbitrary blow-up squares. We explain why the only obstruction is the failure of the Mayer-Vietoris property for unions of closed subschemes. Since this obstruction vanishes after forcing A1-homotopy invariance, this gives a direct new proof of Cisinski's theorem that homotopy K-theory does satisfy cdh descent.
SUMMARY:Adeel Khan (Regensburg): A criterion for descent by blow-ups
URL:https://www.mn.uio.no/math/english/research/projects/mhe/events/seminars/2019-04-30.html
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