Published September 1978
| Published
Journal Article
Open
Minimal Upper Bounds for Sequences of Δ^1_(2n)-Degrees
- Creators
-
Kechris, Alexander S.
Chicago
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Abstract
It is proved here, assuming Projective Determinacy, that every ascending sequence of Δ^1_(2n)-degrees has a minimal strict upper bound but no least strict upper bound. This generalizes a result of Friedman for n = 1.
Additional Information
© 1978, Association for Symbolic Logic. Received April 15, 1977. Research and preparation for this paper were partially supported by NSF Grants MPS75-07562 and MCS76-17254 respectively.Attached Files
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2273527.pdf
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Additional details
- Eprint ID
- 38674
- Resolver ID
- CaltechAUTHORS:20130528-083000082
- NSF
- MPS75-07562
- NSF
- MCS76-17254
- Created
-
2013-05-28Created from EPrint's datestamp field
- Updated
-
2019-10-03Created from EPrint's last_modified field
- Other Numbering System Name
- Zentralblatt MATH Identifier
- Other Numbering System Identifier
- 0405.03019