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Published September 1978 | Published
Journal Article Open

Minimal Upper Bounds for Sequences of Δ^1_(2n)-Degrees

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.

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