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2017 | OriginalPaper | Buchkapitel

On the Strongly Bounded Turing Degrees of the Computably Enumerable Sets

verfasst von : Klaus Ambos-Spies

Erschienen in: Computability and Complexity

Verlag: Springer International Publishing

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Abstract

We introduce and discuss some techniques designed for the study of the strongly bounded Turing degrees of the computably enumerable sets, i.e., of the computable Lipschitz degrees and of the identity bounded Turing degrees of c.e. sets. In particular we introduce some tools which allow the transfer of certain facts on the weak truth-table degrees to these degree structures. Using this approach we show that the first order theories of the partial orderings \((\mathrm {R}_\mathrm {cl},\le )\) and \((\mathrm {R}_\mathrm {ibT},\le )\) of the c.e. \(\mathrm {cl}\)- and \(\mathrm {ibT}\)-degrees are not \(\aleph _0\)-categorical and undecidable. Moreover, various other results on the structure of the partial orderings \((\mathrm {R}_\mathrm {cl},\le )\) and \((\mathrm {R}_\mathrm {ibT},\le )\) are obtained along these lines.

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Metadaten
Titel
On the Strongly Bounded Turing Degrees of the Computably Enumerable Sets
verfasst von
Klaus Ambos-Spies
Copyright-Jahr
2017
DOI
https://doi.org/10.1007/978-3-319-50062-1_34