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A constructive version of Birkhoff's ergodic theorem for Martin-Lof random points

Identifieur interne : 001D03 ( Main/Curation ); précédent : 001D02; suivant : 001D04

A constructive version of Birkhoff's ergodic theorem for Martin-Lof random points

Auteurs : Laurent Bienvenu [France] ; Adam Day [États-Unis] ; Mathieu Hoyrup [France] ; Ilya Mezhirov [Allemagne] ; Alexander Shen [France]

Source :

RBID : Hal:hal-00643629

English descriptors

Abstract

A theorem of Kucera states that given a Martin-Löf random infinite binary sequence {\omega} and an effectively open set A of measure less than 1, some tail of {\omega} is not in A. We first prove several results in the same spirit and generalize them via an effective version of a weak form of Birkhoff's ergodic theorem. We then use this result to get a stronger form of it, namely a very general effective version of Birkhoff's ergodic theorem, which improves all the results previously obtained in this direction, in particular those of V'Yugin, Nandakumar and Hoyrup, Rojas.

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DOI: 10.1016/j.ic.2011.10.006

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<country>Allemagne</country>
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<name sortKey="Shen, Alexander" sort="Shen, Alexander" uniqKey="Shen A" first="Alexander" last="Shen">Alexander Shen</name>
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<orgName>Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier</orgName>
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<orgName>Université de Montpellier</orgName>
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<addrLine>163 rue Auguste Broussonnet - 34090 Montpellier</addrLine>
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<orgName>Centre National de la Recherche Scientifique</orgName>
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<date type="start">1939-10-19</date>
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<country>France</country>
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<idno type="DOI">10.1016/j.ic.2011.10.006</idno>
<series>
<title level="j">Information and Computation</title>
<idno type="ISSN">0890-5401</idno>
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<date type="datePub">2012</date>
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<term>Algorithmic randomness</term>
<term>Birkhoff's ergodic theorem</term>
<term>Martin-Löf randomness</term>
<term>Poincaré recurrence theorem</term>
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<div type="abstract" xml:lang="en">A theorem of Kucera states that given a Martin-Löf random infinite binary sequence {\omega} and an effectively open set A of measure less than 1, some tail of {\omega} is not in A. We first prove several results in the same spirit and generalize them via an effective version of a weak form of Birkhoff's ergodic theorem. We then use this result to get a stronger form of it, namely a very general effective version of Birkhoff's ergodic theorem, which improves all the results previously obtained in this direction, in particular those of V'Yugin, Nandakumar and Hoyrup, Rojas.</div>
</front>
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