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比利时vs摩洛哥足彩
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比利时vs摩洛哥足彩
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university of california san diego
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math 211a: seminar in algebra
professor nicolas monod
epfl
the fixed-point property and piecewise-projective transformations of the line
abstract:
we describe a new and elementary proof of the fact that many groups of piecewise-projective transformation of the line are non-amenable by constructing an explicit action without fixed points. one the one hand, such groups provide explicit counter-examples to the day-von neumann problem. on the other hand, they illustrate that we can distinguish many "layers" of relative non-amenability between nested subgroups.
adrian ioana, alireza golsefidy
november 18, 2024
3:00 pm
apm 7321
research areas
algebra representation theory****************************
