中文

关于Bent方阵数量的一个下界

组合数学 2025-09-09 v3

摘要

Bent函数是达到最大非线性度的布尔函数。它们可以表示为bent方阵,即每一行和每一列都是一个布尔函数的Walsh谱的方阵。利用这种表示,本文证明了对于偶数 nnnn 个变量的bent函数的数量至少为 2n2n2(1+O(1n))2^{n \cdot 2^{\frac{n}{2}} \left(1 + O\left(\frac{1}{n}\right)\right)}

关键词

引用

@article{arxiv.2508.14605,
  title  = {A lower bound on the number of bent squares},
  author = {Jan Kristian Haugland},
  journal= {arXiv preprint arXiv:2508.14605},
  year   = {2025}
}

备注

5 pages. Expanded on the introduction. Rephrased definition of bent functions avoiding repeated "in n variables". Added implied number of bent squares with all vectors of type 1. Fixed typo in expression 2^{n/2-1} in the second to last paragraph of the proof of the theorem. Alphabetized references