Journal of Mathematical Logic 10 (1):1-30 (2010)

We show that there is a non-GL2 degree which is a minimal cover of a minimal degree. This answers a question by Lerman.
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DOI 10.1142/S0219061310000948
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References found in this work BETA

Direct and Local Definitions of the Turing Jump.Richard A. Shore - 2007 - Journal of Mathematical Logic 7 (2):229-262.
Double Jumps of Minimal Degrees.Carl G. Jockusch & David B. Posner - 1978 - Journal of Symbolic Logic 43 (4):715 - 724.
Bounding Non- GL ₂ and R.E.A.Klaus Ambos-Spies, Decheng Ding, Wei Wang & Liang Yu - 2009 - Journal of Symbolic Logic 74 (3):989-1000.
A Hyperimmune Minimal Degree and an ANR 2-Minimal Degree.Mingzhong Cai - 2010 - Notre Dame Journal of Formal Logic 51 (4):443-455.

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2-Minimality, Jump Classes and a Note on Natural Definability.Mingzhong Cai - 2014 - Annals of Pure and Applied Logic 165 (2):724-741.

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