On the Derandomization of Space-Bounded Computations
On the Derandomization of Space-Bounded Computations
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关于空间限制计算的去随机化
DOI:
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发表时间:
1998
期刊:
影响因子:
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通讯作者:
R. Armoni
中科院分区:
文献类型:
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作者:
R. Armoni
We construct a pseudo-random generator for space bounded computations using the extractor of Zuckerman [7]. For machines that use S space and R ≤ 2S1-Ɛ random bits for Ɛ > 0, the generator uses a seed of length O((S log R)/ log S) which is shorter than the seed of both the generator of Nisan [4] and the generator of Nisan and Zuckerman [5]. We then use this generator to derandomize these machines in space O(S√(log R)= log S) which is better than the derandomization of [6].