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arXiv 0909.2388math.NT
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带权达文波特常数

Davenport constant with weights

Pingzhi Yuan, Xiangneng Zeng

摘要:

对于循环群$G=\mathbb{Z}/n\mathbb{Z}$和任何非空的$A\in\mathbb{Z}$。定义$G$的Davenport常数,用$D_A(n)$表示,为最小自然数$k$,使得对于任何具有$x_i\in G$的序列$(x_1, ..., x_k)$,存在非空子序列$(x_{j_1}, ..., x_{j_l})$和$a_1, ..., a_l\in A$,使得$\sum_{i=1}^l a_ix_{j_i} = 0$。类似地,我们将常数$E_A(n)$定义为最小$t\in\mathbb{N}$,使得对于具有$x_i \in G$的所有序列$(x_1, >..., x_t)$,存在索引$j_1, ..., j_n\in\mathbb{N}, 1\leq j_1 <... < j_n\leq t$和具有$\sum^{n}_{i=1} \vartheta_ix_{j_i} = 0$的$\vartheta_1, >..., \vartheta_n\in A$。在本文中,我们表明,$E_A(n)=D_A(n)+n-1$。这解决了Adhikari和Rath \cite{ar06},Adhikari和Chen \cite{ac08},Thangadurai \cite{th07}和Griffiths \cite{gr08}提出的问题。

英文摘要:

For the cyclic group $G=\mathbb{Z}/n\mathbb{Z}$ and any non-empty $A\in\mathbb{Z}$. We define the Davenport constant of $G$ with weight $A$, denoted by $D_A(n)$, to be the least natural number $k$ such that for any sequence $(x_1, ..., x_k)$ with $x_i\in G$, there exists a non-empty subsequence $(x_{j_1}, ..., x_{j_l})$ and $a_1, ..., a_l\in A$ such that $\sum_{i=1}^l a_ix_{j_i} = 0$. Similarly, we define the constant $E_A(n)$ to be the least $t\in\mathbb{N}$ such that for all sequences $(x_1, >..., x_t)$ with $x_i \in G$, there exist indices $j_1, ..., j_n\in\mathbb{N}, 1\leq j_1 <... < j_n\leq t$, and $\vartheta_1, >..., \vartheta_n\in A$ with $\sum^{n}_{i=1} \vartheta_ix_{j_i} = 0$. In the present paper, we show that $E_A(n)=D_A(n)+n-1$. This solve the problem raised by Adhikari and Rath \cite{ar06}, Adhikari and Chen \cite{ac08}, Thangadurai \cite{th07} and Griffiths \cite{gr08}.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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