On the relation of equality modulo countable
V. G. Kanovei, V. A. Lyubetskii
Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow
We prove that the relation of equality modulo countable, restricted to the domain of sets simultaneously $F_\sigma$ and $G_\delta$, admits an effective choice of a representative in every equivalence class.
equality modulo countable, effective choice
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