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SUMMARY:Matthew Kennedy (University of Waterloo)
DTSTART:20210127T200000Z
DTEND:20210127T210000Z
DTSTAMP:20260420T053211Z
UID:NYC-NCG/35
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/NYC-NCG/35/"
 >Amenability\, proximality and higher order syndeticity</a>\nby Matthew Ke
 nnedy (University of Waterloo) as part of Noncommutative geometry in NYC\n
 \n\nAbstract\nI will present new descriptions of some universal flows asso
 ciated to a discrete group\, obtained using what we view as a kind of "top
 ological Furstenberg correspondence."  The descriptions are algebraic and 
 relatively concrete\, involving subsets of the group satisfying a higher o
 rder notion of syndeticity. We utilize them to establish new necessary and
  sufficient conditions for strong amenability and amenability. Furthermore
 \, utilizing similar techniques\, we obtain a characterization of "dense o
 rbit sets\," answering a question of Glasner\, Tsankov\, Weiss and Zucker.
  Throughout the talk\, I will discuss connections to operator algebras.\n\
 nThis is joint work with Sven Raum and Guy Salomon.\n
LOCATION:https://researchseminars.org/talk/NYC-NCG/35/
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