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arXiv math/0101242math.NT
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本文讨论H. Cohn

On a character sum problem of H. Cohn

Par Kurlberg

摘要:

设$f$是有限域$F$上的复值函数,使得对于$x \neq 0$,有$f(0) = 0$,$f(1) = 1$和$|f(x)| = 1$. Cohn问,如果$\sum_{x \in F} f(x) \bar{f(x+h)} = -1$表示$h \neq 0$,是否可以得出$f$是一个非平凡的乘法字符。我们证明了这是有限域的素数基数的情况下,假设$f$的非零值是单位根。

英文摘要:

Let $f$ be a complex valued function on a finite field $F$ such that $f(0) = 0$, $f(1) = 1$, and $|f(x)| = 1$ for $x \neq 0$. Cohn asked if it follows that $f$ is a nontrivial multiplicative character provided that $\sum_{x \in F} f(x) \bar{f(x+h)} = -1$ for $h \neq 0$. We prove that this is the case for finite fields of prime cardinality under the assumption that the nonzero values of $f$ are roots of unity.

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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