Relative Enumerability in the Difference Hierarchy
نویسندگان
چکیده
We show that the intersection of the class of 2-REA degrees with that of the ω-r.e. degrees consists precisely of the class of d.r.e. degrees. We also include some applications and show that there is no natural generalization of this result to higher levels of the REA hierarchy.
منابع مشابه
Relative enumerability in the di erence hierarchy
We show that the intersection of the class of 2-REA degrees with that of the !-r.e. degrees consists precisely of the class of d.r.e. degrees. We also include some applications and show that there is no natural generalization of this result to higher levels of the REA hierarchy.
متن کاملRelative Enumerability in the Diierence Hierarchy
We show that the intersection of the class of 2-REA degrees with that of the !-r.e. degrees consists precisely of the class of d.r.e. degrees. We also include some applications and show that there is no natural generalization of this result to higher levels of the REA hierarchy.
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عنوان ژورنال:
- J. Symb. Log.
دوره 63 شماره
صفحات -
تاریخ انتشار 1998