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{\bf Pingzhi Yuan }
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{\bf Subsequence Sums of Zero-sum-free Sequences}
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Let $G$ be a finite abelian group, and let $S$ be a sequence of
elements in $G$. Let $f(S)$ denote the number of elements in $G$ which
can be expressed as the sum over a nonempty subsequence of $S$. In
this paper, we slightly improve some results of Pixton on $f(S)$
and we show that for every zero-sum-free sequences $S$ over $G$ of
length $|S|=\exp(G)+2$ satisfying $f(S)\geq 4\exp(G)-1$.



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