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ADDITIVE AND SUBTRACTIVE BASES OF $\mathbb {Z}_m$ IN AVERAGE

Part of: Sequences and sets

Published online by Cambridge University Press:  25 November 2024

GUANGPING LIANG ,
YU ZHANG  and
HAODE ZUO Open the ORCID record for HAODE ZUO [Opens in a new window]
GUANGPING LIANG
Affiliation:
School of Mathematical Science, Yangzhou University, Yangzhou 225002, PR China e-mail: 15524259050@163.com
YU ZHANG
Affiliation:
School of Mathematics, Shandong University, Jinan 250100, PR China e-mail: yuzhang0615@mail.sdu.edu.cn
HAODE ZUO*
Affiliation:
School of Mathematical Science, Yangzhou University, Yangzhou 225002, PR China
*
e-mail: yzzxzhd@yzu.edu.cn
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Abstract

Given a positive integer m, let $\mathbb {Z}_m$ be the set of residue classes mod m. For $A\subseteq \mathbb {Z}_m$ and $n\in \mathbb {Z}_m$, let $\sigma _A(n)$ be the number of solutions to the equation $n=x+y$ with $x,y\in A$. Let $\mathcal {H}_m$ be the set of subsets $A\subseteq \mathbb {Z}_m$ such that $\sigma _A(n)\geq 1$ for all $n\in \mathbb {Z}_m$. Let

$$ \begin{align*} \ell_m=\min\limits_{A\in \mathcal{H}_m}\bigg\lbrace m^{-1}\sum_{n\in \mathbb{Z}_m}\sigma_A(n)\bigg\rbrace. \end{align*} $$

Ding and Zhao [‘A new upper bound on Ruzsa’s numbers on the Erdős–Turán conjecture’, Int. J. Number Theory 20 (2024), 1515–1523] showed that $\limsup _{m\rightarrow \infty }\ell _m\le 192$. We prove

$$ \begin{align*} \limsup\limits_{m\rightarrow\infty}\ell_m\leq 144 \end{align*} $$

and investigate parallel results on subtractive bases of $ \mathbb {Z}_m$.

Keywords

representation functionsRuzsa’s numbersprime number theoremadditive bases

MSC classification

Primary: 11B13: Additive bases, including sumsets
Secondary: 11B34: Representation functions

Information

Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 112 , Issue 1 , August 2025 , pp. 47 - 56
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of Australian Mathematical Publishing Association Inc.

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