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JSYML
2007
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14 years 8 months ago
Bounding nonsplitting enumeration degrees
We show that every nonzero Σ0 2 enumeration degree bounds a nonsplitting nonzero enumeration degree.
Thomas F. Kent, Andrea Sorbi
58
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AML
2010
91views more  AML 2010»
14 years 9 months ago
The limitations of cupping in the local structure of the enumeration degrees
Abstract We prove that a sequence of sets containing representatives of cupping partners for every nonzero 0 2 enumeration degree cannot have a 0 2 enumeration. We also prove that ...
Mariya Ivanova Soskova