# Arithmetic progressions in sumsets

Acta Arithmetica (1991)

• Volume: 60, Issue: 2, page 191-202
• ISSN: 0065-1036

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## Abstract

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1. Introduction. Let A,B ⊂ [1,N] be sets of integers, |A|=|B|=cN. Bourgain [2] proved that A+B always contains an arithmetic progression of length $exp{\left(logN\right)}^{1/3-\epsilon }$. Our aim is to show that this is not very far from the best possible. Theorem 1. Let ε be a positive number. For every prime p > p₀(ε) there is a symmetric set A of residues mod p such that |A| > (1/2-ε)p and A + A contains no arithmetic progression of length (1.1)$exp{\left(logp\right)}^{2/3+\epsilon }$. A set of residues can be used to get a set of integers in an obvious way. Observe that the 1/2 in the theorem is optimal: if |A|>p/2, then A+A contains every residue. Acknowledgement. I profited much from discussions with E. Szemerédi; he directed my attention to this problem and to Bourgain’s paper.

## How to cite

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Imre Z. Ruzsa. "Arithmetic progressions in sumsets." Acta Arithmetica 60.2 (1991): 191-202. <http://eudml.org/doc/206433>.

@article{ImreZ1991,
abstract = {1. Introduction. Let A,B ⊂ [1,N] be sets of integers, |A|=|B|=cN. Bourgain [2] proved that A+B always contains an arithmetic progression of length $exp(logN)^\{1/3-ε\}$. Our aim is to show that this is not very far from the best possible. Theorem 1. Let ε be a positive number. For every prime p > p₀(ε) there is a symmetric set A of residues mod p such that |A| > (1/2-ε)p and A + A contains no arithmetic progression of length (1.1)$exp(logp)^\{2/3+ε\}$. A set of residues can be used to get a set of integers in an obvious way. Observe that the 1/2 in the theorem is optimal: if |A|>p/2, then A+A contains every residue. Acknowledgement. I profited much from discussions with E. Szemerédi; he directed my attention to this problem and to Bourgain’s paper. },
author = {Imre Z. Ruzsa},
journal = {Acta Arithmetica},
keywords = {addition of sets; exponential sums; arithmetic progression; upper bound},
language = {eng},
number = {2},
pages = {191-202},
title = {Arithmetic progressions in sumsets},
url = {http://eudml.org/doc/206433},
volume = {60},
year = {1991},
}

TY - JOUR
AU - Imre Z. Ruzsa
TI - Arithmetic progressions in sumsets
JO - Acta Arithmetica
PY - 1991
VL - 60
IS - 2
SP - 191
EP - 202
AB - 1. Introduction. Let A,B ⊂ [1,N] be sets of integers, |A|=|B|=cN. Bourgain [2] proved that A+B always contains an arithmetic progression of length $exp(logN)^{1/3-ε}$. Our aim is to show that this is not very far from the best possible. Theorem 1. Let ε be a positive number. For every prime p > p₀(ε) there is a symmetric set A of residues mod p such that |A| > (1/2-ε)p and A + A contains no arithmetic progression of length (1.1)$exp(logp)^{2/3+ε}$. A set of residues can be used to get a set of integers in an obvious way. Observe that the 1/2 in the theorem is optimal: if |A|>p/2, then A+A contains every residue. Acknowledgement. I profited much from discussions with E. Szemerédi; he directed my attention to this problem and to Bourgain’s paper.
LA - eng
KW - addition of sets; exponential sums; arithmetic progression; upper bound
UR - http://eudml.org/doc/206433
ER -

## References

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1. [1] A. C. Berry, The accuracy of the Gaussian approximation to the sum of independent variables, Trans. Amer. Math. Soc. 49 (1941), 122-136. Zbl0025.34603
2. [2] J. Bourgain, On arithmetic progressions in sums of sets of integers, in: A Tribute to Paul Erdős (A. Baker, B. Bollobás, A. Hajnal, eds.), Cambridge Univ. Press, Cambridge 1990, 105-109. Zbl0715.11006
3. [3] C. G. Esseen, Fourier analysis of distribution functions. A mathematical study of the Laplace-Gaussian law, Acta Math. 77 (1945), 1-125.
4. [4] I. Z. Ruzsa, Essential components, Proc. London Math. Soc. 54 (1987), 38-56.

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