Ends of graphed equivalence relations, I
Ends of graphed equivalence relations, I
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图形等价关系的末端,I
DOI:
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
B. D. Miller
中科院分区:
文献类型:
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作者:
B. D. Miller
Given a countable Borel equivalence relation E on a Polish space, we show: (1) E admits an endless graphing if and only if E is smooth; (2) E admits a locally finite single-ended graphing if and only if E is aperiodic; (3) E admits a graphing for which there is a Borel way of selecting two ends from each component if and only if E is hyperfinite; and (4) E admits a graphing for which there is a Borel way of selecting a finite set of at least three ends from each component if and only if E is smooth.