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
中科院分区:
文献类型:
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作者:
L. Bienvenu;M. Hoyrup;A. Shen
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.