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A semi-linear group which is not affine

✍ Scribed by Pantelis E. Eleftheriou


Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
256 KB
Volume
156
Category
Article
ISSN
0168-0072

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A cohesive set which is not high
✍ Carl Jockusch; Frank Stephan πŸ“‚ Article πŸ“… 1993 πŸ› John Wiley and Sons 🌐 English βš– 1014 KB

## Abstract We study the degrees of unsolvability of sets which are cohesive (or have weaker recursion‐theoretic β€œsmallness” properties). We answer a question raised by the first author in 1972 by showing that there is a cohesive set __A__ whose degree a satisfies a' = 0β€³ and hence is not high. We