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SUMMARY:Sanghyun Kim (KIAS)
DTSTART:20211101T063000Z
DTEND:20211101T073000Z
DTSTAMP:20260423T021234Z
UID:SiN/32
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SiN/32/">Opt
 imal regularity of mapping class group actions on the circle</a>\nby Sangh
 yun Kim (KIAS) as part of Symmetry in Newcastle\n\n\nAbstract\nWe prove th
 at for each finite index subgroup $H$ of the mapping class group of a clos
 ed hyperbolic surface\, and for each real number $r>0$ there does not exis
 t a faithful $C^{1+r}$--action of $H$ on a circle. (Joint with Thomas Kobe
 rda and Cristobal Rivas)\n
LOCATION:https://researchseminars.org/talk/SiN/32/
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