References
Arslanov, M.M.: Structural properties of the degrees below 0′. Dokl. Akad. Nauk SSSR, N.S.283, 270–273 (1985)
Cooper, S.B.: A splitting theorem for then-r.e. degrees (to appear)
Cooper, S.B., Harrington, L., Lachlan, A.H., Lempp, S., Soare, R.I.: A nondensity theorem for thed-r.e. degrees (in preparation)
Cooper, S.B., Lempp, S., Watson, P.R.: Weak density and cupping in thed-r.e. degrees. Isr. J. Math.67, 137–152 (1989)
Downey, R.:D-r.e. degrees and the nondiamond theorem. J. Lond. Math. Soc. (to appear)
Robinson, R.W.: Interpolation and embedding in the recursively enumerable degrees. Ann. Math., II. Ser.93, 586–596 (1971)
Sacks, G.E.: On the degrees less than 0′. Ann. Math. II. Ser.77, 211–231 (1963)
Selivanov, V.L.: On Ershov's hierarchy. Sib. Mat. Zh.26, 134–149 (1985) (Russian)
Shore, R.A., Slaman, T.A.: Working below a low2 recursively enumerable degree (to appear)
Shore, R.A., Slaman, T.A.: Working below a high recursively enumerable degree (in preparation)
Soare, R.I.: Recursively enumerable sets and degrees. Springer, Berlin Heidelberg New York, 1987
Watson, P.R.: ConcerningD-recursively enumerable sets ands-reducibility of∑ 2 sets. Ph.D. thesis, Leeds University, 1988
Author information
Authors and Affiliations
Additional information
We would like to acknowledge the support of a C. N. R. visiting professorship at the University of Siena, March-June 1989, during the preparation of this paper
Rights and permissions
About this article
Cite this article
Cooper, S.B. The density of the low2 n-r.e. degrees. Arch Math Logic 31, 19–24 (1991). https://doi.org/10.1007/BF01370692
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01370692