Splitting and nonsplitting, II: A $low_2$ C.e. Degree above which 0' is not splittable

Journal of Symbolic Logic 67 (4):1391-1430 (2002)
It is shown that there exists a low2 Harrington non-splitting base-that is, a low2 computably enumerable (c.e.) degree a such that for any c.e. degrees x, y, if $0' = x \vee y$ , then either $0' = x \vee a$ or $0' = y \vee a$ . Contrary to prior expectations, the standard Harrington non-splitting construction is incompatible with the $low_{2}-ness$ requirements to be satisfied, and the proof given involves new techniques with potentially wider application
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DOI 10.2178/jsl/1190150292
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