中文

对称群中n-循环的换位子

群论 2025-10-14 v2

摘要

我们证明,对于 n6n \ge 6nn 个符号上的每个偶置换都是两个 nn-循环的换位子。更精确地说,令 SnS_n 为对称群,AnA_n 为交错群。令 C(n)SnC(n) \subset S_n 表示 nn-循环的共轭类,[,][\cdot, \cdot] 为两个置换的换位子。我们证明:映射 C(n)×C(n)An, (τ,π)[τ,π]C(n) \times C(n) \to A_n, \ (\tau, \pi) \mapsto [\tau, \pi] 对所有 n6n \ge 6 都是满射。

关键词

引用

@article{arxiv.2509.22749,
  title  = {Commutators of n-cycles in the symmetric group},
  author = {Philipp Bader},
  journal= {arXiv preprint arXiv:2509.22749},
  year   = {2025}
}

备注

The result presented in this article can be derived from [Ale\v{s} Vavpeti\v{c}, Commutators of cycles in permutation groups, Ars Math. Contemp. 10 (2016)] and is therefore not intended for publication. We thank Goulnara Arzhantseva and Ale\v{s} Vavpeti\v{c} for pointing out the reference as well as for the subsequent discussion and explanations