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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