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arXiv · 0707.1108

Permutation binomials over finite fields

Ariane M. Masuda·Michael E. Zieve
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Abstract

We prove that if x^m + c*x^n permutes the prime field GF(p), where m>n>0 and c is in GF(p)^*, then gcd(m-n,p-1) > sqrt{p} - 1. Conversely, we prove that if q>=4 and m>n>0 are fixed and satisfy gcd(m-n,q-1) > 2q*(log log q)/(log q), then there exist permutation binomials over GF(q) of the form x^m + c*x^n if and only if gcd(m,n,q-1) = 1.

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Ariane M. Masuda, Michael E. Zieve. 2008-12-24. Permutation binomials over finite fields. https://arxiv.org/abs/0707.1108

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