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Low basis theorem
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Low basis theorem : ウィキペディア英語版
Low basis theorem

The low basis theorem in computability theory states that every nonempty \Pi^0_1 class in 2^\omega (see arithmetical hierarchy) contains a set of low degree (Soare 1987:109). It was first proved by Carl Jockusch and Robert I. Soare in 1972 (Nies 2009:57). Cenzer (1993:53) describes it as "perhaps the most cited result in the theory of \Pi^0_1 classes". The proof uses the method of forcing with \Pi^0_1 classes (Cooper 2004:330).
== References ==

* Theorem 3.6, (p. 54 ).
* .
* The original publication, including additional clarifying prose.
* Theorem 1.8.37.
*

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