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Ambos-Spies, Klaus
and
Fejer, Peter A.
2014.
Computational Logic.
Vol. 9,
Issue. ,
p.
443.
Published online by Cambridge University Press: 12 March 2014
In this paper we prove that a degree a is array nonrecursive (ANR) if and only if every degree b ≥ a is r.e. in and strictly above another degree (RRE). This result will answer some questions in [ASDWY]. We also deduce an interesting corollary that every n-REA degree has a strong minimal cover if and only if it is array recursive.