A minimal pair joining to a plus cupping
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Dengfeng Li; Angsheng Li
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Article
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2003
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John Wiley and Sons
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English
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## Abstract A computably enumerable (c.e.) degree a is called nonbounding, if it bounds no minimal pair, and plus cupping, if every nonzero c.e. degree __x__ below __a__ is cuppable. Let **NB** and **PC** be the sets of all nonbounding and plus cupping c.e. degrees, respectively. Both **NB** and **