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SUMMARY:Emily Stark (Wesleyan University)
DTSTART:20211202T150500Z
DTEND:20211202T155500Z
DTSTAMP:20260423T003232Z
UID:GaTO/47
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GaTO/47/">Gr
 aphically discrete groups and rigidity</a>\nby Emily Stark (Wesleyan Unive
 rsity) as part of Geometry and topology online\n\n\nAbstract\nRigidity the
 orems prove that a group's geometry determines its algebra\, typically up 
 to virtual isomorphism. Motivated by rigidity problems\, we study graphica
 lly discrete groups\, which impose a discreteness criterion on the automor
 phism group of any graph the group acts on geometrically. Classic examples
  of graphically discrete groups include virtually nilpotent groups and fun
 damental groups of closed hyperbolic manifolds. We will present new exampl
 es\, proving this property is not a quasi-isometry invariant. We will disc
 uss action rigidity for free products of residually finite graphically dis
 crete groups. This is joint work with Alex Margolis\, Sam Shepherd\, and D
 aniel Woodhouse.\n
LOCATION:https://researchseminars.org/talk/GaTO/47/
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