Geodesic
Two identities related to Dirichlet character of polynomials
Czechoslovak Mathematical Journal, Tome 63 (2013) no. 1, pp. 281-288

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Let $q$ be a positive integer, $\chi $ denote any Dirichlet character $\mod q$. For any integer $m$ with $(m, q)=1$, we define a sum $C(\chi, k, m; q)$ analogous to high-dimensional Kloosterman sums as follows: $$ C(\chi, k, m; q)=\sum _{a_1=1}^{q}{}' \sum _{a_2=1}^{q}{}' \cdots \sum _{a_k=1}^{q}{}' \chi (a_1+a_2+\cdots +a_k+m\overline {a_1a_2\cdots a_k}), $$ where $a\cdot \overline {a}\equiv 1\bmod q$. The main purpose of this paper is to use elementary methods and properties of Gauss sums to study the computational problem of the absolute value $|C(\chi, k, m; q)|$, and give two interesting identities for it.
DOI : 10.1007/s10587-013-0018-0
Classification : 11L05, 11L40
Keywords: Dirichlet character of polynomials; sum analogous to Kloosterman sum; identity; Gauss sum 
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Yao, Weili; Zhang, Wenpeng. Two identities related to Dirichlet character of polynomials. Czechoslovak Mathematical Journal, Tome 63 (2013) no. 1, pp. 281-288. doi: 10.1007/s10587-013-0018-0

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