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UID:20260709T161606EDT-9189LUhhX6@132.216.98.100
DTSTAMP:20260709T201606Z
DESCRIPTION:Title: The Open Graph Dichotomy and the second level of the Bor
 el hierarchy\n\nAbstract:\n\nI will sketch a game-theoretical proof of the
  open graph dichotomy for box-open hypergraphs\, and explain how it can be
  used to obtain various descriptive-set-theoretical dichotomies at the sec
 ond level of the Borel hierarchy. This shows how to generalise these dicho
 tomies from analytic metric spaces to separable metric spaces by working u
 nder the axiom of determinacy.\n	If time allows it\, I will also discuss so
 me connections between cardinal invariants and the chromatic number of the
  graphs at stake.\n	This is joint work with Benjamin D. Miller and Daniel T
 . Soukup.\n
DTSTART:20190219T193000Z
DTEND:20190219T203000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Raphael Carroy (Vienna) 
URL:https://www.mcgill.ca/mathstat/channels/event/raphael-carroy-vienna-294
 667
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