A lemma for cost attained

Annals of Pure and Applied Logic 143 (1-3):87-102 (2006)
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Abstract

A treeable ergodic equivalence relation of integer cost is generated by a free action of the free group on the corresponding number of generators. Every countable treeable ergodic equivalence relation is induced by the free action of some countable group

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Treeable equivalence relations.Greg Hjorth - 2012 - Journal of Mathematical Logic 12 (1):1250003-.

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