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UID:20260624T020739EDT-8357GMwRrI@132.216.98.100
DTSTAMP:20260624T060739Z
DESCRIPTION:Title: Geometry and topology of labeled oriented trees.\n\nAbst
 ract: Whitehead's asphericity conjecture states that a subcomplex of an as
 pherical 2-complex is aspherical. He formulated it as a question in 1941. 
 Whitehead noticed that an affirmative answer implies the asphericity of kn
 ot complements\, a fact unknown at the time. Papakyriakopoulos established
  the asphericity of knot complements in 1957 using 3-manifold topology and
  not relying on Whitehead's ideas. The Whitehead conjecture remains unreso
 lved to this day. Generalized knot complements and their 2-dimensional spi
 nes remain at the center of the conjecture. Presentations for such spines 
 can be encoded by labeled oriented trees\, lot's for short. In my talk I w
 ill give a survey of the algebra\, topology\, and geometry surrounding lab
 eled oriented trees.\n
DTSTART:20191106T200000Z
DTEND:20191106T210000Z
LOCATION:Room 1104\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue
  Sherbrooke Ouest
SUMMARY:Jens Harlander (Boise State University)
URL:/mathstat/channels/event/jens-harlander-boise-stat
 e-university-302206
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