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The Kraft–Barmpalias–Lewis-Pye lemma revisited

04/10/2023

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by Alexander Shen, et al.

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This note provides a simplified exposition of the proof of hierarchical Kraft lemma proven by Barmpalias and Lewis-Pye and its consequences for the oracle use in the Kučera–Gács theorem (saying that every sequence is Turing reducible to a random one).

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