Hyperimmunity in 2\sp ℕ

Notre Dame Journal of Formal Logic 48 (2):293-316 (2007)
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Abstract

We investigate the notion of hyperimmunity with respect to how it can be applied to Π{\sp 0}{\sb 1} classes and their Muchnik degrees. We show that hyperimmunity is a strong enough concept to prove the existence of Π{\sp 0}{\sb 1} classes with intermediate Muchnik degree—in contrast to Post's attempts to construct intermediate c.e. degrees

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10.1305/ndjfl/1179323269

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Citations of this work

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$\Pi _{1}^{0}$ Classes with Complex Elements.Stephen Binns - 2008 - Journal of Symbolic Logic 73 (4):1341 - 1353.
On effectively closed sets of effective strong measure zero.Kojiro Higuchi & Takayuki Kihara - 2014 - Annals of Pure and Applied Logic 165 (9):1445-1469.

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