The importance of Π1 0 classes in effective randomness

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Journal of Symbolic Logic 75 (1):387-400 (2010)
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Abstract

We prove a number of results in effective randomness, using methods in which Π⁰₁ classes play an essential role. The results proved include the fact that every PA Turing degree is the join of two random Turing degrees, and the existence of a minimal pair of LR degrees below the LR degree of the halting problem.

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10.2178/jsl/1264433928

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George Barmpalias, Andrew E. M. Lewis and Keng Meng NG. The importance of Π 0 1 classes in effective randomness. The Journal of Symbolic Logic, vol. 75 (2010), pp. 387–400. - George Barmpalias, Andrew E. M. Lewis and Frank Stephan. Π 0 1 classes, LR degrees and Turing degrees. Annals of Pure and Applied Logic, vol. 156 (2008), pp. 21–38. - Antonin Kučera. Measure, Π 0 1 classes and complete extensions of PA. Recursion Theory Week (Oberwofach, 1984). Lecture Notes in Mathematics, vol. 1141. Springer, Berlin, 1985, pp. 245–259. - Frank Stephan. Martin-Löf randomness and PA complete sets. Logic Colloquium '02. Lecture Notes in Logic, vol. 27, Association for Symbolic Logic, La Jolla, CA, 2006, pp. 342–348. [REVIEW]Douglas Cenzer - 2012 - Bulletin of Symbolic Logic 18 (3):409-412.
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Andrew Lewis
Graduate Theological Union

Citations of this work

A Hierarchy of Computably Enumerable Degrees.Rod Downey & Noam Greenberg - 2018 - Bulletin of Symbolic Logic 24 (1):53-89.
Low upper bounds in the LR degrees.David Diamondstone - 2012 - Annals of Pure and Applied Logic 163 (3):314-320.

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References found in this work

Calibrating randomness.Rod Downey, Denis R. Hirschfeldt, André Nies & Sebastiaan A. Terwijn - 2006 - Bulletin of Symbolic Logic 12 (3):411-491.
Almost everywhere domination and superhighness.Stephen G. Simpson - 2007 - Mathematical Logic Quarterly 53 (4):462-482.
Mass problems and hyperarithmeticity.Joshua A. Cole & Stephen G. Simpson - 2007 - Journal of Mathematical Logic 7 (2):125-143.

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