Layerwise Computability and Image Randomness

Layerwise Computability and Image Randomness
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分层可计算性和图像随机性

DOI:
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发表时间:
2016
影响因子:
0.5
通讯作者:
A. Shen
A. Shen
中科院分区:
计算机科学4区
文献类型:
--
作者:
L. Bienvenu;M. Hoyrup;A. Shen

文献摘要

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数学随机性理论始于一个单独的随机对象的概念。为了合理,这个概念应该有一些自然的性质;特别是,一个对象应该是随机的关于图像分布F(P)(对于某个分布P和某个映射F),当且仅当它有一个P-随机F-原像。这个结果(对于可计算分布和映射,以及Martin-Löf随机性)在很长一段时间内都是已知的(民间传说);对于分层可计算映射,它在Hoyrup和Rojas(2009,命题5)中被提到(甚至对于更一般的可计算度量空间)。本文给出了一个证明,并讨论了有关的定量结果和应用。
Algorithmic randomness theory starts with a notion of an individual random object. To be reasonable, this notion should have some natural properties; in particular, an object should be random with respect to the image distribution F(P) (for some distribution P and some mapping F) if and only if it has a P-random F-preimage. This result (for computable distributions and mappings, and Martin-Löf randomness) was known for a long time (folklore); for layerwise computable mappings it was mentioned in Hoyrup and Rojas (2009, Proposition 5) (even for more general case of computable metric spaces). In this paper we provide a proof and discuss the related quantitative results and applications.