Under analytic determinacy, continuum many idealistic analytic equivalence relations are not classwise Borel isomorphic to any orbit equivalence relation, and a 1997 conjecture is refuted.
Infinitary properties of abelian torsion groups.Ann
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Structural results on idealistic equivalence relations
Under analytic determinacy, continuum many idealistic analytic equivalence relations are not classwise Borel isomorphic to any orbit equivalence relation, and a 1997 conjecture is refuted.