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SUMMARY:Symplectic matrices and the Bloch group - Don Zagier (Max-Planck-I
 nstitut für Mathematik\, Bonn)
DTSTART:20220727T141500Z
DTEND:20220727T151500Z
UID:TALK176798@talks.cam.ac.uk
DESCRIPTION:The Bloch group of a field\, which is isomorphic up to torsion
  to its third K-group but has a much more elementary definition and is muc
 h easier to work with\, plays a role in many questions of 3-dimensional to
 pology and quantum invariants. The talk would discuss some of these and an
  alternative approach to the Bloch group\, based on symplectic matrices ov
 er Z\, that arises from the so-called Neumann-Zagier equations for idealtr
 iangulations of hyperbolic 3-manifolds.&nbsp\; If time allows\, some other
  potential applications and related topics such as Nahm sums and the Habir
 o ring will also be discussed.
LOCATION:Seminar Room 2\, Newton Institute
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