Measures of pseudorandomness for finite sequences: Typical values

N. Alon*, Y. Kohayakawa, C. Mauduit, C. G. Moreira, V. Rödl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Mauduit and Sárközy introduced and studied certain numerical parameters associated to finite binary sequences EN ∈ [-1, 1]N in order to measure their 'level of randomness'. Those parameters, the normality measure (EN), the well-distribution measure W(EN), and the correlation measure Ck(EN) of order k, focus on different combinatorial aspects of EN. In their work, amongst others, Mauduit and Sárközy (i) investigated the relationship among those parameters and their minimal possible value, (ii) estimated (EN), W(EN) and Ck(EN) for certain explicitly constructed sequences EN suggested to have a 'pseudorandom nature', and (iii) investigated the value of those parameters for genuinely random sequences en.In this paper, we continue the work in the direction of (iii) above and determine the order of magnitude of (E N), W(EN) and Ck(EN) for typical EN. We prove that, for most EN ∈ [-1, 1]N, both W(EN) and (EN) are of order √ N, while C k(EN) is of order Nlog(Nk) for any givEN 2 ≤ k ≤ N/4.

Original languageEnglish
Pages (from-to)778-812
Number of pages35
JournalProceedings of the London Mathematical Society
Issue number3
StatePublished - Nov 2007


FundersFunder number
Brazil/France Agreement in Mathematics69-0140/03-7, 60-0014/01-5
James Wolfensohn fund
State of New Jersey
National Science FoundationCCR-0324906
United States-Israel Binational Science Foundation
Fundação de Amparo à Pesquisa do Estado de São Paulo
Conselho Nacional de Desenvolvimento Científico e Tecnológico306334/2004–6, 479882/2004–5
Israel Science Foundation
Ministério da Ciência e Tecnologia0072064, 300647/95–6, 662416/1996–1, 910064/99–7, DMS 0300529


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