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Classification of a class of planar quadrinomials

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arxiv 2404.14291 v3 pith:2U2VFBYC submitted 2024-04-22 math.NT

classification math.NT
keywords mathbbplanarunderlinecharacteriseclassclassificationequivalenceform
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abstract

Let $p$ be an odd prime, $k,\ell$ be positive integers, $q=p^k, Q=p^{\ell}$. In this paper we characterise planar functions of the form $f_{\underline{c}}(X)=c_0X^{qQ+q}+c_1X^{qQ+1}+c_2X^{Q+q}+c_3X^{Q+1}$ over $\mathbb{F}_{q^2}$ for any $\underline{c}=(c_0,c_1,c_2,c_3) \in \mathbb{F}_{q^2}^4$ in terms of linear equivalence.

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  1. Some permutation pentanomials over finite fields of even characteristic

    math.CO 2024-12 conditional novelty 5.0 of 10

    Three new infinite families of permutation pentanomials over F_{q^2}, q=2^m, are proved to be linearly equivalent to power maps, unifying 14 known sporadic examples.

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