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Ends of graphed equivalence relations. II - MaRDI portal

Ends of graphed equivalence relations. II (Q1001453)

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scientific article; zbMATH DE number 5508746
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Ends of graphed equivalence relations. II
scientific article; zbMATH DE number 5508746

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    Ends of graphed equivalence relations. II (English)
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    17 February 2009
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    For Part I see [\textit{B. D. Miller}, Isr. J. Math. 169, 375--392 (2009; Zbl 1166.03026)]. Given a graphing \(G\) of a countable Borel equivalence relation on a Polish space, the authors show that if there is a~Borel way of selecting a non-empty closed set of countably many ends from each \(G\)-component, then there is a Borel way of selecting an end or line from each \(G\)-component. Their method yields also Glimm-Effros-style dichotomies that characterize the circumstances under which: (1) there is a Borel way of selecting a point or end from each \(G\)-component; and (2) there is a Borel way of selecting a point, end or line from each \(G\)-component.
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    countable Borel equivalence relations
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    graphings of equivalence relations
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    dichotomies
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