Borel-piecewise continuous reducibility for uniformization problems
(1608.03269)Abstract
We study a fine hierarchy of Borel-piecewise continuous functions, especially, between closed-piecewise continuity and $G\delta$-piecewise continuity. Our aim is to understand how a priority argument in computability theory is connected to the notion of $G\delta$-piecewise continuity, and then we utilize this connection to obtain separation results on subclasses of $G_\delta$-piecewise continuous reductions for uniformization problems on set-valued functions with compact graphs. This method is also applicable for separating various non-constructive principles in the Weihrauch lattice.
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