A contemporary area of research in descriptive set theory studies Borel equivalence relations. A Borel equivalence relation on a Polish space X is a Borel subset of that is an equivalence relation on X.
Read more about this topic: Descriptive Set Theory
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“Subject the material world to the higher ends by understanding it in all its relations to daily life and action.”
—Ellen Henrietta Swallow Richards (1842–1911)
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