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DTSTART:20240310T070000
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DTSTART:20231105T060000
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DTSTART;TZID=America/Toronto:20240910T140000
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URL:https://uwaterloo.ca/pure-mathematics/events/logic-seminar-66
SUMMARY:Logic Seminar
CLASS:PUBLIC
DESCRIPTION:ANDY ZUCKER\n\nTopological groups with tractable minimal dynami
 cs\n\nFor Polish groups\, there are several interesting dividing lines in 
 how\ncomplicated their minimal flows can be. While metrizability of the\nu
 niversal minimal flow is the most obvious\, a theorem of Ben Yaacov\,\nMel
 leray\, and Tsankov suggests the broader class of Polish groups\nwhose uni
 versal minimal flows have a comeager orbit. In joint work\nwith Gianluca B
 asso\, we find natural extensions of these classes to\ngeneral topological
  groups\, obtaining the classes of topological\ngroups with ``concrete min
 imal dynamics'' or ``tractable minimal\ndynamics\,'' respectively. Both cl
 asses admit a wide variety of\nnon-trivial characterizations. In particula
 r\, the class of groups with\ntractable minimal dynamics is the largest cl
 ass of topological groups\nadmitting any form of KPT correspondence\, allo
 wing us to show that\nthis class is absolute between models of set theory.
 \n\nMC 5479
DTSTAMP:20260504T234153Z
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