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UID:20260514T074528EDT-5289V8d6JC@132.216.98.100
DTSTAMP:20260514T114528Z
DESCRIPTION:Title:2-Systems of arcs on spheres with prescribed endpoints.\n
 \nAbstract: A 2-system of arcs on an n-punctured sphere S is a collection 
 of (homotopy classes of) simple arcs on S joining punctures and pairwise i
 ntersecting at most twice. Bar-Natan proved that a 2-system of arcs on S b
 eginning and ending at a fixed puncture has size at most n choose 3. In th
 is talk\, I will sketch a proof that the same holds for a 2-system of arcs
  on S joining a fixed pair of distinct punctures.\n
DTSTART:20190227T200000Z
DTEND:20190227T210000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Sami Douba\, McGill University
URL:https://www.mcgill.ca/mathstat/channels/event/sami-douba-mcgill-univers
 ity-294932
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