ON SOME PERMUTATION POLYNOMIALS OVER Fq OF THE FORM xrh(x(q−1)/d)

Abstract

In a recent paper, Akbary and Wang gave a sufficient condition for x + x to permute Fq, in terms of the period of a certain sequence involving sums of cosines. As an application they gave necessary and sufficient conditions in case u, r, q satisfy certain special properties. We show that the Akbary-Wang sufficient condition follows from a more general… (More)

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