On the Borel class of the derived set operator
Douglas Cenzer, R. Daniel Mauldin (1982)
Bulletin de la Société Mathématique de France
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Displaying similar documents to “An analytic equivalence relation not arising from a Polish group action”
On the Borel class of the derived set operator
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Given a countable Borel equivalence relation, I introduce an invariant measuring how difficult it is to find Borel sets separating its equivalence classes. I evaluate these invariants in several standard generic extensions.
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