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UID:20260530T094417EDT-4742hI8Soh@132.216.98.100
DTSTAMP:20260530T134417Z
DESCRIPTION:Title: Subgroups of Out(F_r) generated by Dehn (multi-)twists.
 \n\nAbstract: Pick two (multi)-curves on a surface. What can be said about
  the subgroup generated by powers of Dehn twists about the two curves? For
  twists about single curves a complete classification up to isomorphism is
  known and is determined by intersection number and twist power. For multi
 -curves with more components\, the fourth powers of the twists generate a 
 free group. I will present analogous results for groups generated by two D
 ehn (multi-)twists in Out(F_r)\, where the analysis is complicated by the 
 absence of a standard topological model.\n\n \n
DTSTART:20180321T190000Z
DTEND:20180321T200000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Edgar Bering (Temple University)
URL:https://www.mcgill.ca/mathstat/channels/event/edgar-bering-temple-unive
 rsity-285925
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