Abstract
Publisher Summary This chapter discusses projective equivalence relations. If E is a Ξ 1 βΌ1 equivalence relation on IR then IR/E is countable, or else E admits a non-empty perfect set of pairwise inequivalent reals. The chapter describes inductive and coinductive equivalence relations. A set of reals A β IR is Ξ»-Souslin, if it is the projection of the set of branches of a tree T on w Γ Ξ». The complement of such a set is called βcoβΞ»βSouslin.β
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