A transversal of full outer measure

by Kumar and Shelah. [KmSh:1068]
Advances in Math, 2017
We prove that for any set of real and equivalence relations on it such that every equivalence class is countable, there is a transversal (= a set of representations of the equivalence relations, i.e. having exactly one member in each equivalence class) with the same outer measure.

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