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UID:1980@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20171107T110000
DTEND;TZID=Europe/Paris:20171107T120000
DTSTAMP:20210312T145039Z
URL:https://www.i2m.univ-amu.fr/evenements/some-applications-of-commutator
 s/
SUMMARY:Ville Salo (University of Turku\, Finland): Some applications of co
 mmutators
DESCRIPTION:Ville Salo: To a group action and a sigma-algebra of clopen set
 s on some space\, we associate a "controlled group action"\, where the act
 ion of the group can depend on events in the sigma-algebra. We discuss the
  basic properties of this definition\, and then give some applications whe
 n the controlled group is perfect\, arising from a simple commutator trick
 . Applications are given in two contexts related to logical gates\, and in
  two contexts related to groups of symbolic-dynamical origin. We also get 
 a short proof of the classical fact that there are uncountably many non-is
 omorphic finitely generated groups.
ATTACH;FMTTYPE=image/jpeg:https://www.i2m.univ-amu.fr/wp-content/uploads/2
 020/01/Ville_Salo.jpg
CATEGORIES:Séminaire,Ernest
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DTSTART:20171029T020000
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