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SUMMARY:Professor Steve Jackson Bernoulli Lecture - Undecidability in the 
 Theory of Abelian Group Actions
DTSTART:20180208T171500
DTEND:20180208T181500
DTSTAMP:20260408T034038Z
UID:52129e09caa9a747c7a13a9eadf9963272cf5da91f0a84e615517e55
CATEGORIES:Conferences - Seminars
DESCRIPTION:Steve Jackson (University of North Texas)    \nThe combina
 torics of abelian group actions on Polish spaces has been the subject of r
 ecent investigation\, and is (somewhat surprisingly) interesting and non-t
 rivial. If one considers the actions of Zn\, we see a pattern develop: pro
 blems which are easy for n=1 become much more difficult for n at least 2. 
 We discuss three example of this phenomenon: the subshift\, graph homomorp
 hism and tiling problems. For the first two problems\, we show the questio
 ns are undecidable for n at least 2\, while for the third problem the ques
 tion is open.
LOCATION:BI A0 448 https://plan.epfl.ch/?room==BI%20A0%20448
STATUS:CONFIRMED
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