随机性缺陷之间的关系
Relations between randomness deficiencies
摘要:
随机序列的概念是由Martin-Loef在1966年提出的。与此同时,他定义了所谓的随机性亏损函数,该函数显示了随机序列与非随机序列(在某种自然意义上)的接近程度。其他亏函数可以从莱文-施诺尔定理(Levin-Schnorr theorem)得到,该定理用柯尔莫哥洛夫复杂度(Kolmogorov complexity)描述随机性。所有这些缺陷之间的差异由对数项限定。在本文中,我们表明,一些缺陷之间的差异可以尽可能大。
英文摘要:
The notion of random sequence was introduced by Martin-Loef in 1966. At the same time he defined the so-called randomness deficiency function that shows how close are random sequences to non-random (in some natural sense). Other deficiency functions can be obtained from the Levin-Schnorr theorem, that describes randomness in terms of Kolmogorov complexity. The difference between all of these deficiencies is bounded by a logarithmic term. In this paper we show that the difference between some deficiencies can be as large as possible.
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