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Theoretical Computer Science
Computably enumerable sets in the solovay and the strong weak truth table degrees
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Maximal Pairs of Computably Enumerable Sets in the Computably Lipschitz Degrees
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On the Gap Between Trivial and Nontrivial Initial Segment Prefix-Free Complexity
Theory of Computing Systems
Analogues of Chaitin's Omega in the computably enumerable sets
Information Processing Letters
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We show that there are Turing complete computably enumerable sets of arbitrarily low nontrivial initial segment prefix-free complexity. In particular, given any computably enumerable set A with nontrivial prefix-free initial segment complexity, there exists a Turing complete computably enumerable set B with complexity strictly less than the complexity of A. On the other hand it is known that sets with trivial initial segment prefix-free complexity are not Turing complete. Moreover we give a generalization of this result for any finite collection of computably enumerable sets A"i, i