Journal of Symbolic Logic
- J. Symbolic Logic
- Volume 54, Issue 1 (1989), 16-25.
Abstract Hierarchies and Degrees
The aim of this paper is to enrich the algebraic-axiomatic approach to recursion theory developed in  by an analogue to the classical arithmetical hierarchy and an abstract notion of degree. The results presented here are rather initial and elementary; indeed, the main problem was the very choice of right abstract concepts.
J. Symbolic Logic, Volume 54, Issue 1 (1989), 16-25.
First available in Project Euclid: 6 July 2007
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Ivanov, Ljubomir L. Abstract Hierarchies and Degrees. J. Symbolic Logic 54 (1989), no. 1, 16--25. https://projecteuclid.org/euclid.jsl/1183742847