On the convergence of query-bounded computations and logical closure properties of C.e. Sets

Journal of Symbolic Logic 66 (4):1543-1560 (2001)
Abstract
Call a set A n-correctable if every set Turing reducible to A via a Turing machine that on any input makes at most n queries is Turing reducible to A via a Turing machine that on any input makes at most n-queries and on any input halts no matter what answers are given to its queries. We show that if a c.e. set A is n-correctable for some n ≥ 2, then it is n-correctable for all n. We show that this is the optimal such result by constructing a c.e. set that is 1-correctable but not 2-correctable. The former result is obtained by examining the logical closure properties of c.e. sets that are 2-correctable
Keywords Bounded Queries   Logical Closure Properties   Adversaries
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