随机字符串集合的约简:资源受限的情况
Reductions to the set of random strings: The resource-bounded case
摘要:
本文的动机是由一个猜想,BPP的特点是多项式时间的非适应性减少到一组Kolmogorov随机字符串。在本文中,我们表明,在[Allender等人]中提出的解决这个猜想的方法在没有重大改变的情况下无法成功,但是如果我们考虑时间有界的Kolmogorov复杂性,它确实会结出果实。我们表明,如果一个集合A是可约在多项式时间的时间t有界Kolmogorov随机字符串的集合(所有足够大的时间界限t),那么A是在P/poly,如果此外,这样的减少存在于任何通用的图灵机的定义中使用的Kolmogorov复杂性,那么A是在PSPACE。
英文摘要:
This paper is motivated by a conjecture that BPP can be characterized in terms of polynomial-time nonadaptive reductions to the set of Kolmogorov-random strings. In this paper we show that an approach laid out in [Allender et al] to settle this conjecture cannot succeed without significant alteration, but that it does bear fruit if we consider time-bounded Kolmogorov complexity instead. We show that if a set A is reducible in polynomial time to the set of time-t-bounded Kolmogorov random strings (for all large enough time bounds t), then A is in P/poly, and that if in addition such a reduction exists for any universal Turing machine one uses in the definition of Kolmogorov complexity, then A is in PSPACE.
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