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Minimal Complements for Degrees below 0´

Andrew Lewis
The Journal of Symbolic Logic
Vol. 69, No. 4 (Dec., 2004), pp. 937-966
Stable URL: http://www.jstor.org/stable/30041773
Page Count: 30
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Minimal Complements for Degrees below 0´
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Abstract

It is shown that for every (Turing) degree 0 < a < 0´ there is a minimal degree m < 0´ such that a ∨ m = 0´ (and therefore a ∧ m = 0).

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