1.
Computability, Enumerability, Unsolvability Directions in Recursion Theory
by Cooper, S. B., Slaman, T. A...
ISBN: 9780521557368
List Price: $84.00
2.
Forcing, Iterated Ultrapowers, and Turing Degrees
by Chong, C. T., Feng, Qi, Sla...
ISBN: 9789814699945