Initial segments of degrees below 0'

Providence, R.I.: American Mathematical Society (1981)
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Abstract

MOTIVATION The constructivization of ; => D(_£^') poses several problems. For some of these the tools of MD can be modified; for others new methods will need to be established. What must we do to make a full approximation to ; * D? We ...

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Complementing below recursively enumerable degrees.Rl Epstein - 1987 - Annals of Pure and Applied Logic 34 (1):15-32.

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