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The hypersimple-free c.e. wtt degrees are dense in the c.e. wtt degrees

Barmpalias, George and Lewis-Pye, Andrew (2006) The hypersimple-free c.e. wtt degrees are dense in the c.e. wtt degrees. Notre Dame Journal of Formal Logic, 47 (3). pp. 361-370. ISSN 0029-4527

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Identification Number: 10.1305/ndjfl/1163775443

Abstract

We show that in the c.e. weak truth table degrees if b < c then there is an a which contains no hypersimple set and b < a < c. We also show that for every w < c in the c.e. wtt degrees such that w is hypersimple, there is a hypersimple a such that w < a < c. On the other hand, we know that there are intervals which contain no hypersimple set.

Item Type: Article
Official URL: http://projecteuclid.org/DPubS?service=UI&version=...
Additional Information: © 2006 University of Notre Dame
Divisions: Mathematics
Subjects: Q Science > QA Mathematics
Date Deposited: 06 Aug 2013 11:13
Last Modified: 04 Jan 2024 18:12
URI: http://eprints.lse.ac.uk/id/eprint/51422

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