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A set A ⊆ ω is called 2-computably enumerable (2-c.e.), if there are computably enumerable sets A1 and A2 such that A1 −A2 = A. A set A ⊆ ω is quasi-reducible to a set B ⊆ ω (A ≤Q B), if there is a computable function g such that for all x ∈ ω we have x ∈ A if and only if Wg(x) ⊆ B. This reducibility was introduced by Tennenbaum (see [1], p.207) as an example of a reducibility which differs fro...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2008
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s174392130903049x