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SUMSETS AND DIFFERENCE SETS CONTAINING A COMMON TERM OF A SEQUENCE

Part of: Sequences and sets Extremal combinatorics

Published online by Cambridge University Press:  26 September 2011

QUAN-HUI YANG  and
YONG-GAO CHEN
QUAN-HUI YANG
Affiliation:
School of Mathematical Sciences and Institute of Mathematics, Nanjing Normal University, Nanjing 210046, PR China
YONG-GAO CHEN*
Affiliation:
School of Mathematical Sciences and Institute of Mathematics, Nanjing Normal University, Nanjing 210046, PR China (email: ygchen@njnu.edu.cn)
*
✉For correspondence; e-mail: ygchen@njnu.edu.cn
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Abstract

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Let β>1 be a real number, and let {ak} be an unbounded sequence of positive integers such that ak+1/ak≤β for all k≥1. The following result is proved: if n is an integer with n>(1+1/(2β))a1 and A is a subset of {0,1,…,n} with , then (A+A)∩(A−A) contains a term of {ak }. The lower bound for |A| is optimal. Beyond these, we also prove that if n≥3 is an integer and A is a subset of {0,1,…,n} with , then (A+A)∩(A−A) contains a power of 2. Furthermore, cannot be improved.

Keywords

sumsetsdifference setssequences

MSC classification

Secondary: 11B13: Additive bases, including sumsets 05D05: Extremal set theory
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 85 , Issue 1 , February 2012 , pp. 79 - 83
Copyright
Copyright © Australian Mathematical Publishing Association Inc. 2011

Footnotes

This work was supported by the National Natural Science Foundation of China, Grant No. 11071121.

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