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比利时vs摩洛哥足彩 ,
university of california san diego

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math 288 - probability seminar

joshua frisch

cal tech

proximal actions, strong amenability, and infinite conjugacy class groups.

abstract:

a topological dynamical system (i.e. a group acting by homeomorphisms on a compact topological space) is said to be proximal if for any two points p and q we can simultaneously push them together i.e. there is a sequence $g_n$ such that $lim g_n(p)=lim g_n (q)$. in his paper introducing the concept of proximality glasner noted that whenever $z$ acts proximally that action will have a fixed point. he termed groups with this fixed point property ``strongly amenable'' and showed that non-amenable groups are not strongly amenable and virtually nilpotent groups are strongly amenable. in this talk i will discuss recent work precisely characterizing which (countable) groups are strongly amenable.

host: todd kemp

november 8, 2018

10:00 am

ap&m 6402

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