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SUMMARY:Anschel Schaffer-Cohen (University of Pennsylvania)
DTSTART:20220127T161500Z
DTEND:20220127T170000Z
DTSTAMP:20260422T065353Z
UID:CJCS/49
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CJCS/49/">Au
 tomorphisms of the loop and arc graph of an infinite-type surface</a>\nby 
 Anschel Schaffer-Cohen (University of Pennsylvania) as part of Copenhagen-
 Jerusalem Combinatorics Seminar\n\n\nAbstract\nWe show that the extended b
 ased mapping class group of an infinite-type surface is naturally isomorph
 ic to the automorphism group of the loop graph of that surface. Additional
 ly\, we show that the extended mapping class group stabilizing a finite se
 t of punctures is isomorphic to the arc graph relative to that finite set 
 of punctures. This extends a known result for sufficiently complex finite-
 type surfaces\, and provides a new angle from which to study the mapping c
 lass groups of infinite-type surfaces.\n
LOCATION:https://researchseminars.org/talk/CJCS/49/
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