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14

APAL
1998

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Computably Enumerable Sets and Quasi-Reducibility

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Computably Enumerable Sets and Quasi-Reducibility

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We consider the computably enumerable sets under the relation of Qreducibility. We ﬁrst give several results comparing the upper semilattice of c.e. Q-degrees, RQ, ≤Q , under this reducibility with the more familiar structure of the c.e. Turing degrees. In our ﬁnal section, we use coding methods to show that the elementary theory of RQ, ≤Q is undecidable.

Rodney G. Downey, Geoffrey LaForte, André N

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APAL 1998 | Enumerable Sets | Familiar Structure | Upper Semilattice |

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Added	21 Dec 2010
Updated	21 Dec 2010
Type	Journal
Year	1998
Where	APAL
Authors	Rodney G. Downey, Geoffrey LaForte, André Nies

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