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math.LO2014
Dichotomy Theorems for Families of Non-Cofinal Essential Complexity
John D. Clemens, Dominique Lecomte, Benjamin D. Miller
We prove that for every Borel equivalence relation , either is Borel reducible to , or the family of Borel equivalence relations incompatible with has cof…
math.LO2014
Essential countability of treeable equivalence relations
Dominique Lecomte, John D. Clemens, Benjamin D. Miller
We establish a dichotomy theorem characterizing the circumstances under which a treeable Borel equivalence relation E is essentially countable. Under additional topological assumpt…