BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:S. Petrakos (WWU Münster\, Germany) DTSTART:20230512T140000Z DTEND:20230512T160000Z DTSTAMP:20260415T032053Z UID:AthensFAOA/60 DESCRIPTION:Title: Dynamical Alternating Groups\nby S. Petrakos (WWU Münster\, Germa ny) as part of Functional analysis and operator algebras in Athens\n\n\nAb stract\nTopological full groups form a very important class of groups aris ing from\ndynamical systems and\, more generally\, étale groupoids. Their subgroups\, especially the\nalternating subgroup\, have been proven to ex hibit various properties\, some of which were\nrarely or never before witn essed. In this talk I will introduce these groups in the dynamical\nsettin g and go through some of the most important past results on the topic\, fo cusing on\nthose of operator-algebraic interest. I will then briefly intro duce the concept of almost\nfiniteness and present a recent result obtaine d in joint work with Petr Naryshkin. We prove\nthat if a subgroup of a TFG is amenable and contains the alternating subgroup\, then all its\nfree ac tions on finite-dimensional compact metrizable spaces are almost finite.\n LOCATION:https://researchseminars.org/talk/AthensFAOA/60/ END:VEVENT END:VCALENDAR