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SUMMARY:Sang-hyun Kim (Korea Institute for Advanced Study)
DTSTART:20220302T020000Z
DTEND:20220302T033000Z
DTSTAMP:20260412T204048Z
UID:SAGO/15
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SAGO/15/">Op
 timal regularity of mapping class group actions on the circle</a>\nby Sang
 -hyun Kim (Korea Institute for Advanced Study) as part of Algebra Seminar 
 (presented by SMRI)\n\n\nAbstract\nWe prove that for each finite index sub
 group H of the mapping class group of a \nclosed hyperbolic surface\, and 
 for each real number r>1 there does not exist a faithful \nC^r-action (in 
 Hoelder’s sense) of H on a circle. For this\, we partially determine the
  \noptimal regularity of faithful actions by right-angled Artin groups on 
 a circle. (Joint \nwith Thomas Koberda and Cristobal Rivas).\n
LOCATION:https://researchseminars.org/talk/SAGO/15/
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