Gao n+ D-1定理的加权推广
A weighted generalization of Gao's n+D-1 Theorem
摘要：
设$G$表示阶为$n$、Davenport常数为$D$的有限阿贝尔群，并设$m= n+D-1$ .令$x=(x_1, ..., x_m)\in G^m$是具有由$x_m$获得的最大重复$\ell$的序列，并将$r=\min(D,\ell)$。设$w=(w_1, ..., w_{m-r})\in \Z^{m-r}.$，则存在$n$ -子集$I\subset [1,m-r]$和注入$f: I\mapsto [1,m]$，使得$m\in f(I)$和$$\sum_{i\in I}w_{i}x_{f({i})}=(\sum_{i\in I}w_{i})x_{m}.$$
英文摘要：
Let $G$ denotes a finite abelian group of order $n$ and Davenport constant $D$, and put $m= n+D-1$. Let $x=(x_1, ..., x_m)\in G^m$ be a sequence with a maximal repetition $\ell$ attained by $x_m$ and put $r=\min(D,\ell)$. Let $w=(w_1, ..., w_{m-r})\in \Z^{m-r}.$ Then there are an $n$-subset $I\subset [1,m-r]$ and an injection $f: I\mapsto [1,m]$, such that $m\in f(I)$ and $$\sum_{i\in I}w_{i}x_{f({i})}=(\sum_{i\in I}w_{i})x_{m}.$$
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