Note on a Zero-Sum Problem

Note on a Zero-Sum Problem
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DOI:
10.1006/jcta.2001.3181
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发表时间:
2001-08
期刊:
J. Comb. Theory A
影响因子:
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通讯作者:
Weidong Gao
Weidong Gao
中科院分区:
其他
文献类型:
--
作者:
Weidong Gao

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设G是一个相加的有限阿贝尔群,exp(G)是它的指数。设S=(a1,…), ak)为G中的元素序列;我们说S是零和序列如果i= 1ai =0。设s(G)是最小的整数t,使得G中t个元素的每一个序列都包含一个长度为exp(G)的零和子序列。在过去20年中,有几位作者对该常数进行了研究[1,11]。设Cn是n阶的循环群,Cn是k个拷贝Cn的直积。在[3]中,Erdo s等人证明了s (cn)=2n&1。s(cn)的几何解释是由Harborth在1986年给出的。1980年,Kemntiz提出了以下建议
Let G be an additively written, finite abelian group, and exp(G ) its exponent. Let S=(a1 , ..., ak) be a sequence of elements in G; we say that S is a zero-sum sequence if i=1 ai=0. Let s(G ) be the samllest integer t such that every sequence of t elements in G contains a zero-sum subsequence of length exp(G ). This constant has been studied by serveral authors during last 20 years [1 9, 11]. Let Cn be the cyclic group of order n, and C n the direct product of k copies of Cn . In [3], Erdo s et al. proved that S(C n)=2n&1. A geometrical interpretation of s(C n) was given by Harborth in [8]. In 1980, Kemntiz suggested the following