On Polish groups admitting non-essentially countable actions
On Polish groups admitting non-essentially countable actions
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关于波兰团体承认非本质上可数的行动
DOI:
10.1017/etds.2020.133
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发表时间:
2022
影响因子:
0.9
通讯作者:
ZIELINSKI, JOSEPH
中科院分区:
文献类型:
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作者:
KECHRIS, ALEXANDER S.;MALICKI, MACIEJ;PANAGIOTOPOULOS, ARISTOTELIS;ZIELINSKI, JOSEPH
It is a long-standing open question whether every Polish group that is not locally compact admits a Borel action on a standard Borel space whose associated orbit equivalence relation is not essentially countable. We answer this question positively for the class of all Polish groups that embed in the isometry group of a locally compact metric space. This class contains all non-archimedean Polish groups, for which we provide an alternative proof based on a new criterion for non-essential countability. Finally, we provide the following variant of a theorem of Solecki: every infinite-dimensional Banach space has a continuous action whose orbit equivalence relation is Borel but not essentially countable.
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Journal of Symbolic Logic (JSL)
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