The analogue of Erdős–Turán conjecture in Zm☆
The analogue of Erdős–Turán conjecture in Zm☆
复制标题
DOI:
10.1016/j.jnt.2008.03.005
复制
发表时间:
2008-09
影响因子:
0.7
通讯作者:
Yong-Gao Chen
中科院分区:
文献类型:
--
作者:
Yong-Gao Chen
Given a set A⊂N let σA(n) denote the number of ordered pairs (a,a′)∈A×A such that a+a′=n. The celebrated Erdős–Turán conjecture states that if A⊂N such that σA(n)⩾1 for all sufficiently large n, then the representation function σA(n) must be unbounded. For each positive integer m, let Rmbe the least positive integer r such that there exists a set A⊆Zmwith A+A=Zmand σA(n)⩽r. Ruzsa's method in [I.Z. Ruzsa, A just basis, Monatsh. Math. 109 (1990) 145–151] implies that Rmmust be bounded. It is pleasure to call Rma Ruzsa's number. In this paper we prove that all Ruzsa's numbers Rm⩽288. This improves the previous bound Rm⩽5120. Several related open problems are proposed. VIDEO ABSTRACT: For a video summary of this paper, please visit http://www.youtube.com/watch?v=hgDwkwg_LzY.