The degrees below a 1-generic degree $

Journal of Symbolic Logic 51 (3):770 - 777 (1986)
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Abstract

It is shown that the nonrecursive predecessors of a 1-generic degree $ are all 1-generic. As a corollary, it is shown that the 1-generic degrees are not densely ordered

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Dynamic notions of genericity and array noncomputability.Benjamin Schaeffer - 1998 - Annals of Pure and Applied Logic 95 (1-3):37-69.
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