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Friedman–Hyttinen–Weinstein conjecture on Borel reducibility across the Main Gap
In Generalized Descriptive Set Theory, consider the isomorphism relations of classifiable and non-classifiable theories on structures of the relevant uncountable cardinality. Fried…
Conjectureopenborel-reducibility generalized-descriptive-set-theory model-theoryarXiv posted 2 days ago

Friedman–Hyttinen–Weinstein conjecture on Borel reducibility across the Main Gap