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DTSTART:20240310T070000
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DTSTART:20231105T060000
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DTSTART;TZID=America/Toronto:20240806T140000
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URL:https://uwaterloo.ca/pure-mathematics/events/logic-seminar-65
SUMMARY:Logic Seminar
CLASS:PUBLIC
DESCRIPTION:COLIN JAHEL (TU DRESDEN)\n\nWhen invariance implies exchangeabi
 lity (and what it means for\ninvariant Keisler measures)\n\nLet M be a cou
 ntable model-theoretic structure. We study the actions\nof Aut(M) on space
 s of expansions of M and more precisely\, the\ninvariant probability measu
 res under this action. In particular we are\ninterested in understanding w
 hen Aut(M)-invariance actually implies\nS_\\infty invariance. We obtain a 
 nice classification for many\nclassical structures. Finally we connect thi
 s to invariant Keisler\nmeasures\, showing how for many structures\, they 
 must be\nS_\\infty-invariant. We use this fact to illustrate the differenc
 e\nbetween two notion of smallness for formulas\, forking and universal\nm
 easure zero.\n\nMC 5403
DTSTAMP:20260505T184449Z
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