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Abstract: Recently, the weight distributions of the duals of the cyclic codes with two zeros have been obtained for several cases in Ma et al. (2011) [10], Ding et al. (2011) [6], Wang et al. (2012) [15], Xiong (2012) [16,17]. In this paper we solve one more special case. The problem of finding the weight distribution is transformed into a problem of evaluating certain character sums over finite fields, which in turn can be solved by using the Jacobi sums directly. [Copyright &y& Elsevier]

Abstract: Recently, the weight distributions of the duals of the cyclic codes with two zeros have been obtained for several cases in Ma et al. (2011) , Ding et al. (2011) , Wang et al. (2011) . In this paper we provide a slightly different approach toward the general problem and use it to solve one more special case. We make extensive use of standard tools in number theory such as characters of finite fields, the Gauss sums and the Jacobi sums to transform the problem of finding the weight distribution into a problem of evaluating certain character sums over finite fields, which on the special case is related with counting the number of points on some elliptic curves over finite fields. Other cases are also possible by this method. [Copyright &y& Elsevier]

Abstract: For the finite field of q elements (q odd) and a quadratic non-residue (that is, a non-square) , we define the distance function on the upper half plane . For two sets with , and a non-trivial additive character ψ on , we give the following estimate which (assuming that ) is non-trivial if as . [Copyright &y& Elsevier]