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UID:20261114T182424EST-3431FKHX8I@132.216.98.100
DTSTAMP:20261114T232424Z
DESCRIPTION:✒️ TITLE / TITRE\n\nA Combinatorial Approach to Dynamics\n\n📄 A
 BSTRACT / RÉSUMÉ \n\nTopological dynamics is the study of continuous group
  actions. In this context\, the best understood groups are the Abelian one
 s\, especially $\mathbb{Z}$\, while the general theory remains far less cl
 ear. However\, recent years saw the emergence of powerful methods that oft
 en work without any assumptions on the group at all. Instead of group theo
 ry\, these methods are based on techniques from combinatorics and descript
 ive set theory. I will illustrate this development by addressing the follo
 wing very basic but surprisingly challenging problem: If $\Delta$ is a sub
 group of $\Gamma$\, does $\Gamma$ have a free continuous action on a compa
 ct space without any nontrivial closed $\Delta$-invariant subsets? Based o
 n joint work with Joshua Frisch.\n\n📍 PLACE / LIEU\n	Hybride - CRM\, Salle 
 / Room 5340\, Pavillon André Aisenstadt\n\n\n	☕ Le colloque sera précédé d'
 une pause café à 14h45 au Salon Maurice-L'Abbé / The colloquium will be pr
 eceded by a coffee break at 2:45 p.m. - Salon Maurice-L'Abbé\n
DTSTART:20261113T203000Z
DTEND:20261113T213000Z
SUMMARY:Anton Bernshteyn (UCLA)
URL:https://www.mcgill.ca/mathstat/channels/event/anton-bernshteyn-ucla-375
 597
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