共查询到19条相似文献,搜索用时 109 毫秒
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《数学的实践与认识》2020,(4)
求解完全非线性函数的原像分布,是决定和分析完全非线性函数以及构造相应线性码的公开问题和重要课题之一.研究了完全非线性函数的原像分布所满足的基本方程的当m=7时的情形,求出了当n=7~r、n=2~s.7~r以及n=3~s.7~r时方程的所有整数解. 相似文献
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利用代数数论的有关知识与理论,研究了从3l阶交换群到3阶交换群上完全非线性函数的原像分布特征方程,通过讨论其等价方程x2+xy+Y2=l的整数解问题,给出了该类完全非线性函数存在的必要条件及其原像分布特征的计数.进一步给出了求该类完全非线性函数所有可能原像分布特征的一个算法. 相似文献
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Galois环和Z/(m)环上完全非线性函数的性质 总被引:3,自引:0,他引:3
本文把完全非线性函数推广到了有限Abel群上,利用特征谱讨论了Z/(m)上Bent函数与GF(pe)上bent函数以及完全非线性函数定义之间的关系;给出Galois环与Z/(m)上最佳线性逼近的特征谱表示,得到完全非线性函数在某种程度上能抵抗最佳线性逼近攻击的结论;并给出一种Galois环与Z/(m)环上完全非线性函数的构结方法. 相似文献
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一个Bargmann系统与一个Neumann系统 总被引:1,自引:0,他引:1
耿献国 《数学物理学报(A辑)》1993,13(1):80-84
本文引入一个特征值问题导出一类非线性演化方程,在位势与特征函数之间的两种不同的约束下,此特征值问题被非线性化为一个以为Hamiltonian函数的完全可积的Bargmann系统和一个以为Hamiltonian函数的完全可积的O.Neumann系统。 相似文献
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在适当的条件下,用边界摄动理论和微分不等式技巧,研究了一类摄动不仅发生在方程而且同时发生在内部点和边界处的非线性奇摄动问题.利用改进以往相关文献中辅助函数的构造证明了解的存在性,得到了原问题解以及解的导函数的任意阶一致有效渐近表达式.本文的结果丰富和推广了相关成果. 相似文献
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套格图桑 《高校应用数学学报(A辑)》2017,32(1)
给出函数变换,变量分离形式解与第一种椭圆方程相结合的方法,构造了(2+1)维modified Zakharov-Kuznetsov(m ZK)方程的多种复合型新解.步骤一,给出两种函数变换,将(2+1)维m ZK方程转化为能够获得变量分离解的非线性发展方程.步骤二,给出非线性发展方程的变量分离形式解,通过第一种椭圆方程及其相关结论,构造了(2+1)维m ZK方程的双孤子解和双周期解等复合型新解. 相似文献
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《数学年刊B辑(英文版)》1993,(5)
等离子物理相对论 Vlasov-Maxwell 方程组的稳态解Jrgen Batt Karl Fabian本文考虑了电荷粒子分布函数的 Vlasov 方程和等离子体电磁场的 Maxwell 方程相对论耦合组的稳态解.利用非线性泛函分析的工具,根据不同的几何特征和对称性,以及分布函数依赖于一,二个或三个独立的运动积分,证明了解的存在性. 相似文献
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Binary linear codes with good parameters have important applications in secret sharing schemes, authentication codes, association schemes, and consumer electronics and communications. In this paper, we construct several classes of binary linear codes from vectorial Boolean functions and determine their parameters, by further studying a generic construction developed by Ding et al. recently. First, by employing perfect nonlinear functions and almost bent functions, we obtain several classes of six-weight linear codes which contain the all-one codeword, and determine their weight distribution. Second, we investigate a subcode of any linear code mentioned above and consider its parameters. When the vectorial Boolean function is a perfect nonlinear function or a Gold function in odd dimension, we can completely determine the weight distribution of this subcode. Besides, our linear codes have larger dimensions than the ones by Ding et al.’s generic construction. 相似文献
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This paper derives general analytical formulae for the conformal maps from multiply connected circular preimage domains to
multiply connected quadrature domains by considering the Bergman kernel functions of the preimage and target domains. The
new formulae are expressed in terms of the Schottky–Klein prime function. They generalize, to the case of arbitrary connectivity,
a formula relevant to doubly connected domains derived by Y. Avci in 1977.
Submitted: September 17, 2007. Accepted: June 5, 2008. 相似文献
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As a generalization of almost perfect nonlinear functions, generalized almost perfect nonlinear (GAPN) functions defined over finite fields of odd characteristic have also important applications in cryptography and finite geometry. In this paper, we mainly focus on GAPN power functions, and a new class of such function (up to EA equivalence) is obtained. Furthermore, using our method, almost all the known GAPN power functions can be confirmed in a simple way. 相似文献
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An Erratum has been published for this article in Journal of Combinatorial Designs 14: 82–82, 2006 . We give the equivalence between perfect nonlinear functions and appropriate splitting semi‐regular relative difference sets, construct a class of splitting relative difference sets by using Galois rings and bent functions, and prove that there exists a 4‐phase perfect nonlinear function if and only if the number of input variables is at least twice the number of output variables. © 2005 Wiley Periodicals, Inc. 相似文献
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V. I. Buslaev 《Mathematical Notes》2016,100(5-6):781-789
It is shown that a well-known expression for the capacity of the preimage of a compact set under a polynomial map remains valid in the case of a rational map, provided that the standard capacity of the preimage is replaced by its capacity in the external field determined by the poles in C of the rational function determining the map. 相似文献
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A new class of almost perfect nonlinear (APN) polynomial functions has been recently introduced. We give some generalizations of these functions and deduce new families of perfect nonlinear (PN) functions. We show that these PN functions are CCZ-inequivalent to the known perfect nonlinear functions. 相似文献
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We classify the almost perfect nonlinear (APN) functions in dimensions 4 and 5 up to affine and CCZ equivalence using backtrack programming and give a partial model for the complexity of such a search. In particular, we demonstrate that up to dimension 5 any APN function is CCZ equivalent to a power function, while it is well known that in dimensions 4 and 5 there exist APN functions which are not extended affine (EA) equivalent to any power function. We further calculate the total number of APN functions up to dimension 5 and present a new CCZ equivalence class of APN functions in dimension 6. 相似文献
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J. Vermeer 《Topology and its Applications》1984,17(3):217-232
We show that for each space X, there exists a smallest basically disconnected perfect irreducible preimage ΛX. A corollary of the existence of ΛX is that each locally compact and basically disconnected space X has a smallest basically disconnected compactification. 相似文献
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We show that, for a certain class of nonlinear functions of Gaussian sequences, the limiting distribution of normalized sums of the nonlinear function values of a sequence is the convolution of a Gaussian distribution with another non-Gaussian distribution. 相似文献