Further results on permutation polynomials from trace functions
Further results on permutation polynomials from trace functions
复制标题
来自迹函数的置换多项式的进一步结果
DOI:
10.1007/s00200-020-00456-6
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发表时间:
2020
影响因子:
0.7
通讯作者:
Yuan Pingzhi
中科院分区:
文献类型:
--
作者:
Wu Danyao;Yuan Pingzhi
For a prime p and positive integers m, n, letF q be a finite field withq = p m elements andF q n be an extension ofF q . Let h(x) be a polynomial overF q n satisfying the following conditions: (i)Tr m nm ( x ) ∘ h ( x ) = τ ( x ) ∘ Tr m nm ( x ) ; (ii) For anys ∈ F q , h(x) is injective onTr m nm ( x ) - 1 ( s ) , whereτ ( x ) is a polynomial overF q . Forb , c ∈ F q ,δ ∈ F q n , and positive integers i, j, d withq ≡ ± 1 ( mod d ) , we propose a class of permutation polynomials of the form $$\begin{aligned} b({\mathrm{Tr}}_m^{nm}(x)+\delta )^{1+\frac{i(q^n-1)}{d}}+c({\mathrm{Tr}}_m^{nm}(x)+\delta )^{1+\frac{j(q^n-1)}{d}}+h(x) \end{aligned}$$ b ( Tr m nm ( x ) + δ ) 1 + i ( q n - 1 ) d + c ( Tr m nm ( x ) + δ ) 1 + j ( q n - 1 ) d + h ( x ) overF q n by employing the Akbary–Ghioca–Wang (AGW) criterion in this paper. Accordingly, we also present the permutation polynomials of the form $$\begin{aligned} b({\mathrm{Tr}}_m^{nm}(x)+\delta )^{1+\frac{i(q^n-1)}{d}}+h(x) \end{aligned}$$ b ( Tr m nm ( x ) + δ ) 1 + i ( q n - 1 ) d + h ( x ) by lettingc = 0 and choosing some special i, which covered some known results of this form.