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DTSTART:20230312T070000
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DTSTART;TZID=America/Toronto:20240212T150000
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URL:https://uwaterloo.ca/pure-mathematics/events/special-colloquium-60
SUMMARY:Special Colloquium
CLASS:PUBLIC
DESCRIPTION:SHIRLY GEFFEN\, UNIVERSITÄT MÜNSTER\n\n\"DYNAMICAL COMPARISO
 N AND NONAMENABLE GROUPS\"\n\nWe pull back paradoxical dynamical systems (
 e.g. hyperbolic  groups\nacting on their Gromov boundary)\, to paradoxica
 l decompositions of the\nacting group itself. This allows to show that whe
 never such groups\nadmit a minimal amenable topologically free action on a
  compact\nHausdorff space\, the attached crossed product C*-algebra is cla
 ssified\nby K-theoretic data.\n\nThis is joint work with Eusebio Gardella\
 , Julian Kranz\, and Petr\nNaryshkin.\n\nMC 5501
DTSTAMP:20260512T045319Z
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