Let $R$ be a Borel equivalence relation with countable equivalence classes, on the standard Borel space $(X, \mathscr{A}, \mu)$. Let $\sigma$ be a 2-cohomology class ...
This talk will be an introduction to the field of Borel equivalence relations (also called invariant descriptive set theory). No background will be assumed. We will motivate the main object of study: ...
This is a preview. Log in through your library . Abstract We prove that the class of Borel equivalence relations, under the order of Borel reducibility, is a very complicated structure, by embedding ...
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