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Published online: 1992-08-31
Some Descriptive-Set-Theoretical Problems in Complexity TheoryHisao Tanaka (1) Hosei University, Tokyo, Japan
We bring some descriptive-set- theoretical problems into complexity theory. We here deal with the imiformization problem and the separation problem. It is shown that 1) there exists an oracle A such that for some set S∈P[A] the uniformizator U, is not in NP[A], 2) there is an oracle A such that Sep (NP[A]) does not hold and hence so does not Unif (coNP[A[), and 3) there is an oracle A such that Sep(NEXT[A]) does not hold and hence so does not Unif(coNEXT[A]).
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Tanaka Hisao: Some Descriptive-Set-Theoretical Problems in Complexity Theory. Publ. Res. Inst. Math. Sci. 28 (1992), 603-614. doi: 10.2977/prims/1195168210