中文

关于仿射经典群中错位置换的比例

组合数学 2026-05-06 v2 群论

摘要

我们推导了仿射经典群 AUm(q)AU_m(q)ASp2m(q)ASp_{2m}(q)AO2m+1(q)AO_{2m+1}(q)AO2m±(q)AO^{\pm}_{2m}(q) 中错位置换及其 pp 次方阶数错位置换的精确比例,其中 pp 表示定义有限域的特征。在单位情形下,公式依赖于一个独有兴趣的分区结果:我们获得将整数分区 λ=(λ1,,λm)\lambda=(\lambda_1, \dots, \lambda_m) 的生成函数,其中 λ1λm\lambda_1\ge \dots \ge \lambda_m,且满足 λ1=1\lambda_1=1λk1>λk=k\lambda_{k-1}>\lambda_k=k(其中 k{2,,m}k \in \{2, \dots,m\})。在辛正交情形下,公式的证明归约为验证三个 qq 多项式恒等式,这些恒等式由作者提出,后由Fulman和Stanton证明。

关键词

引用

@article{arxiv.2508.07093,
  title  = {On the proportion of derangements in affine classical groups},
  author = {Jessica Anzanello},
  journal= {arXiv preprint arXiv:2508.07093},
  year   = {2026}
}

备注

Revised version. All previous conjectures are now stated as theorems, following Fulman and Stanton's proof of the three q-polynomial identities conjectured in the first version of this paper (see arXiv:2510.16277). This version also treats the even characteristic case for affine symplectic and orthogonal groups