对于增加无穷序列的Kolmogorov复杂度,两个源比一个源更好
Two sources are better than one for increasing the Kolmogorov complexity of infinite sequences
摘要:
一个无限二进制序列的随机率由Kolmogorov复杂度与序列初始段长度之比的序列来表征。已知没有统一有效的方法将一个输入序列转换成另一个具有更高随机率的序列。相比之下,我们展示了这样一个统一的有效的程序,作为输入两个独立的序列,积极的,但任意小的恒定随机率。此外,该变换是一个真值表约简,输出具有任意接近1的随机率。
英文摘要:
The randomness rate of an infinite binary sequence is characterized by the sequence of ratios between the Kolmogorov complexity and the length of the initial segments of the sequence. It is known that there is no uniform effective procedure that transforms one input sequence into another sequence with higher randomness rate. By contrast, we display such a uniform effective procedure having as input two independent sequences with positive but arbitrarily small constant randomness rate. Moreover the transformation is a truth-table reduction and the output has randomness rate arbitrarily close to 1.
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