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On a problem of Cooper and Epstein
Published online by Cambridge University Press: 12 March 2014
Abstract
In “Bounding minimal degrees by computably enumerable degrees” by A. Li and D. Yang, (this Journal, [1998]), the authors prove that there exist non-computable computably enumerable degrees c > a > 0 such that any minimal degree m being below c is also below a. We analyze the proof of their result and show that the proof contains a mistake. Instead we give a proof for the opposite result.
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- Copyright © Association for Symbolic Logic 2003