Introduction
Part I. The Structure of the Degrees: 1. Recursive functions
2. Embeddings and extensions of embeddings in the degrees
3. The jump operator
4. High/low hierarchies
Part II. Countable Ideals of Degrees: 5. Minimal degrees
6. Finite distributive lattices
7. Finite lattices
8. Countable usls
Part III. Initial Segments ofD and the Jump Operator: 9. Minimal degrees and high/low hierarchies
10. Jumps of minimal degrees
11. Bounding minimal degrees with recursively enumerable degrees
12. Initial segments of D [0,0']
Appendix A. Coding into structures and theories
Appendix B. lattice tables and representation theorems
References
Notation index
Subject index.
