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∑5-completeness of index sets arising from the lattice of recursively enumerable sets

✍ Scribed by Michael A. Jahn


Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
795 KB
Volume
80
Category
Article
ISSN
0168-0072

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📜 SIMILAR VOLUMES


The Index Set of Injectively Enumerable
✍ Stephan Wehner 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 372 KB

## Abstract I introduce an effective enumeration of all effective enumerations of classes of r. e. sets and define with this the index set __IE__ of injectively enumerable classes. It is easy to see that this set is ∑~5~ in the Arithmetical Hierarchy and I describe a proof for the ∑~5~‐hardness of