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DTSTART:20230312T070000
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DTSTART:20231105T060000
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DTSTART;TZID=America/Toronto:20231129T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20231129T153000
URL:https://uwaterloo.ca/pure-mathematics/events/logic-seminar-53
SUMMARY:Logic Seminar
CLASS:PUBLIC
DESCRIPTION:ANDY ZUCKER\, DEPARTMENT OF PURE MATHEMATICS\, UNIVERSITY OF WA
 TERLOO\n\n\"ULTRACOPRODUCTS OF G-FLOWS\"\n\nGiven a topological group G\, 
 a G-flow is a continuous action of G on a\ncompact Hausdorff space X. This
  talk will discuss a notion of\nultracoproduct for G-flows\, which arise f
 rom considering ultraproducts\nof commutative G-C*-algebras by Gelfand dua
 lity. We apply the\nconstruction to develop an understanding of the proper
 ties of various\nclasses of subflows of a flow\, i.e. minimal\, topologica
 lly transitive\,\netc. For groups which are locally Roelcke precompact\, u
 ltracoproducts\nof G-flows lead to a well-behaved notion of weak containme
 nt for a\nwide class of G-flows\, and in particular for all G-flows when G
  is\nlocally compact. In joint work with Gianluca Basso\, we apply\nultrac
 oproducts of G-flows to achieve a new characterization of those\nPolish gr
 oups G with the property that every minimal flow has a\ncomeager orbit.\n\
 nMC 5479
DTSTAMP:20260506T094811Z
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