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On the degree spectrum of a π01 class

Downey, Rod, Greenberg, Noam, Lewis-Pye, Andrew and Montalbán, Antonio (2013) On the degree spectrum of a π01 class. Transactions of the American Mathematical Society, 365 (06). pp. 2977-3018. ISSN 0002-9947

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Identification Number: 10.1090/S0002-9947-2012-05660-1


Toward establishing the decidability of the two-quantifier theory of the Δ02 Turing degrees with join, we study extensions of embeddings of upper-semi-lattices into the initial segments of Turing degrees determined by computably enumerable sets, in particular, the degree of the halting set 0'. We obtain a good deal of sufficient and necessary conditions.

Item Type: Article
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Additional Information: © 2013 American Mathematical Society
Divisions: Mathematics
Subjects: Q Science > QA Mathematics
Date Deposited: 06 Aug 2013 11:50
Last Modified: 16 May 2024 01:40

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